Good puzzle, as always from Dac.   This one I found on the easy side esp bottom half of grid.    Solving time, 12 mins.

* = anagram  < = reversed

ACROSS

1 POS(t)ERS     Excellent surface reading

4 CH (IN) A SE  A    rush = chase

10 STE(E)P    Definition very straightforward.   Edge could be either end of precipice so I’d some doubts at first before crossing letters confirmed.

11 EUROT RASH   (route)*   spots = rash    New word for me that I worked out from the wordplay when I’d some crossing letters.    Disparaging US reference to rich Europeans apparently.

12 ITEMISE    Hidden    document (vb) here so clue misled nicely

13 DURABLE   (a builder)* less i      Well-concealed anagram

15 TOAD-IN-THE-HOLE     (Heat oil then do)*    My first answer and one of my favourite dishes, maybe seen less often today.

18 TOP OF THE WORLD    Carpenters hit from 1973 - fairly easy from the enumeration and wordplay

22 IN (DIA) N  A    aid<   inn = local   a = area

24 HAD R(I)AN    Topical

25 PRACTICAL   Double definition - very easy clue

27 ORDER   Double definition

28 RAP A CITY

29 PLEDGE   Double definition

DOWN

1 PA SSIM   (miss)<    Excellent surface

2 STEREOTYPED   (seedy Potter)*   Amusing surface, bringing Dennis to mind

3 REP L ICA   Clue splits seamlessly at model/theatre

5 HE ROD

6 NITERIE  (in Tiree)*

7 SPA   Hidden reversal

8 A (CHIEf) VER     Aver = state      Can’t ever recall seeing or hearing it other than in a puzzle.

9 F (EVER) ISH    School = collective name for fish

14 BROAD MINDED

16 T (OWN H) ALL     Definition = municipal building    H = horse (heroin)  have = own  tall = big

17 S (start of show) TRIPPER

19 FR ANTIC(s)

20 RED POLL

21 EN TREE    Seasoned solvers will think quickly enough of ‘tree’ for plane, perhaps.  en = in (French).   Good surface reading

23 AS C OT     Not quite sure of the wordplay here, but have verified my answer.   I think it’s as = like and (to c)<   with c for cycle.    It’s not however given in any of my dicts to hand as an abbreviation so I may be on the wrong track    “Like to cycle around town”

26 (w)ASP

A tricky puzzle with one or two involved clues, but entertaining.  Some explanations were not clear to me,
e.g. 23a and 27a.

ACROSS

1.    WILDEBEEST -(*edible stew)
7.    JOAN  - ( female name: jo(B)-an)
9.    DERV  - hidden in CI-der v-INEGAR - Acronym: Diesel Engine Road Vehicle)
10.  SIMNEL CAKE - ( s-*nicemeal to include K for 1000.  Would not necessarily call
                                       this a sweet, or pudding. Traditionally made at Easter.)
11.   STINGO - (s-ting-o - an old beer, sharp or strong liquor)
12.   NAISSANT - ( n-a issan-t - Nissan car manufacturer with ‘a’ and first of turnover)
13.   VALKYRIE - ( <lav- Kyri {ti Kawana, changed from Kiri} -e. Are they goddesses?
                                Handmaidens to Odin in Norse myths, but does this make them so?)
15.   REEF   - (<free, with ‘f’ going to end)
17.   VEAL  - (H-<alve-D)
19.   CHISWICK - (chi-s-w-ick.  Sick as in ‘a sick joke’ i.e tasteless)
22.   MORAY EEL - (Mo-*early with its first letter. ‘Mo’ is often used as abbreviation for Maureen)
23.   CRAVAT - (Not sure about this . Jazz fan is Cat, but is the word play RA for artist, or Rav
                               for musician?)
22.   ART NOUVEAU - (*van outer -au).  Art Movement which peaked in early 20th century)
25.   TOLL - (A-toll:  The Bikini name of 2-piece  swim suit  was taken from Bikini Atoll - some think it was
                        to create a shock equal to the atomic testing at that place.)
27.   SPEY - (Another small answer which has me puzzled.  Where do the ’spades’  come in?
                        Is the ‘certainly’ <yes or <yep?  Help needed.)
28.   THE TEMPEST - (The {article}- t-emp-est - ‘test’ as in ’screen’.)
DOWN

2.    INERTIA- ( *rainiest without ’s’)
3.    DIVAN - ( diva-n {last letter Carmen})
4.    BISTOURY -( *ritu yobs - omits ‘la’ - a surgical knife with narrow blade used to
                                open abscesses and fistuals - Ugh!)
5.    EMMANUEL COLLEGE - ( *molecule name +leg - College of Cambridge University)
6.    TIEPIN - t- i-ep-in - ( i and odd letters of ‘keep’ in ‘tin.)
7.    JACK STRAW - (Jolly Jack , a sailor, with straw as the sucker.  JS is a Labour MP who
                                      has held various government posts including Sec. of State for Justice
                                      and Lord Chancellor)
8.    ASKANCE - ( Alaskan without LA, + ce - This was a clever mislead as Eskimo came to mind)
14.  KILLARNEY - (kill-*yearn )
16.  TINCTURE - ( tin-c-t-ure - first letter of ‘this’ in cure.  An alcoholic extract such as spirits.
                                Often used humourously when suggesting a drink.)
18.   EGO TRIP  - (e-*gtrio-p - EP record.)
20.   CHABLIS - ( cha-bl-is.)
21.   JESUIT - ( je-suit.  French for ‘I’ with ‘ suit’ for agree with.  Jesuit often used to describe someone
                              with clever but unsound reasoning.  Jesuits were feared by many in the established
                              church because of their influence and ingenuity.)
24.   ACT UP - (* caput)

dd = double definition
cd = cryptic definition
rev = reversed or reversal
ins = insertion
cha = charade
ha = hidden answer
*(fodder) = anagram

Another challenging puzzle which was also amusing due to the many cleverly crafted definitions

ACROSS
1 EMOTED (d) emoted (put lower down) IMO, the biggest luvvy is Sidney Poitier for over-acting and exaggerating every facial expression
5 HARD CORE dd worthy of Cyclops, the other alter ego
9 GLEE CLUB Cha of glee (joy) & club (hit)
#10 LEAGUE Le (French article) AGUE (more a fever than a disease)
11 NIGEL KENNEDY Rev of LEG (supporter) IN (elected) + Kennedy - Nigel Kennedy (born 1956, England) is a violinist and violist.
#13 YARD Very convoluted language used to indicate rev of DRAY (carrier)
14 TREE FROG Ins of REEF (key) in *(grot) - I love the misleading definition for this creature
17,18 IMPERIAL UNIT *(painters milieu minus SE) The six are marked # here
20 PREPUBESCENT Ins of E (Everest’s starting point) in P (parking) RE (on) PUB (local) SCENT (trail)
23 THIRST T (time) Hirst (Damien) English artist and leader of “Young British Artists” group)
24 OIL PAINT Ins of I in *(Plato in)
25 INCHOATE IN (at home) CHOCOLATE minus COL (pass)
26 THE WHO Ins of HEW (fashion) in THO (short for though) The Who are an English rock band formed in 1964. The primary lineup consisted of guitarist Pete Townshend, vocalist Roger Daltrey, bassist John Entwistle and drummer Keith Moon.

DOWN
#2 MILE (s) mile
3 TIE-AND-DYE *(any edited)
4 DELUGE Cha of D (day) E (7th letter of Whistler) LUGE (Winter Olympics event)
5 HUBBLE TELESCOPE HUB (centre) + Ins of L (large) in *(Beetle) SCOPE (range)
6 RELIEVED Ins of E (earth) in relived (conjured up memories)
#7 CHAIN C (cold) H (hot) *(in a)
8 ROUND ROBIN Cha of ROUND (about) ROBIN (bird) I didn’t know that those Christmas letters I get are also called thus
12 CARMARTHEN A very formulaic charade of CAR (banger) MART (selling place) HEN (just for women) for this Welsh town. Fortunately, the surface is slow
15 FLUCTUATE Ins of CTU *(cut) + A in FLUTE (wind instrument)
16 CIABATTA *(act a bit) + A - unleavened Italian white bread made with olive oil and flour, popular for its thick, soft centre.
19 ZEALOT In of EA (each) in ZLOT (y) Polish currency
#21 PERCH dd
#22 INCH ha

There was a different crossword in the paper to that on-line - see blog for no. 6809 for details.
In a comment on that blog Eimi mentions that this is also a Virgilius puzzle, from before the Feb-2008 inception of the on-line offering, but I can’t find a posting here that fits it so here is one.
I didn’t get very far with this on first attempt and had to put it to one side when real life got in the way. So when I looked at this site to find out it had been a different puzzle in the paper, and it was gone midnight, I was forced to finish it off on my own.
I had taken a print so if anyone wants more clue reminders I have them.
There seem to be many Cryptic Defs. (CD) in this puzzle ranging from the very easy to head scratchers.