PETO kicks off the week…
An enjoyable Monday morning puzzle. A couple of my parsings might be a bit dodgy.
Thanks PETO!

ACROSS
1. Translucent boil mostly having an uneven surface (3-7)
SEE-THROUGH
SEETH[e] (boil, mostly) + ROUGH (having an uneven surface)
6. Greek god’s accuser apparently hiding on the way back (4)
ARES
([accu]SER A[pparently] (hiding))< (<on the way back)
9. A literary sub-genre, on the other hand, not concerned with pursuing fun (3,4)
AGA SAGA
(AGA[in] (on the other hand, not IN (concerned with)) pursuing A GAS (fun)
10. Marsupial mouse endlessly swimming across river heading south (7)
OPOSSUM
((MOUS[e] (endlessly))* (*swimming)) across (PO (river) + S (south))
12. Put forward as fact in online comment embracing individualism at the outset (5)
POSIT
POST (online comment) embracing I[ndividualism] (at the outset)
13. Start to hold forth about Gail oddly back at home (9)
ORIGINATE
ORATE (hold forth) about ((G[a]I[l] (oddly))< (<back) + IN (at home))
14. Unnamed cardinal surprisingly thorough (7)
RADICAL
(CARDI[n]AL (unnamed, i.e. without N (name)))* (*surprisingly)
16. Shame about American bear (7)
SUSTAIN
STAIN (shame) about US (American)
19. Went without my turn to advance (7)
PROCEED
PEED (went) without (COR)< (my, <turn)
21. Wise monarch accepting immediately (7)
KNOWING
KING (monarch) accepting NOW (immediately)
22. Betrayal of Republican entrapped by schoolmaster at end of story (9)
TREACHERY
R (Republican) entrapped by TEACHER (schoolmaster) + [stor]Y (at end of)
24. Put in position by expert on Poland (5)
PLACE
ACE (expert) on PL (Poland)
26. Lacking enthusiasm to take in books on royal authority (7)
CONTROL
COOL (lacking enthusiasm) to take in (NT (books) on R (royal))
27. Shown openly eating Bill’s ham (7)
OVERACT
OVERT (shown openly) eating AC (bill)
28. Carry young child easily at first (4)
TOTE
TOT (young child) + E[asily] (at first)
29. Entire set split up before daughter becomes personally involved (10)
INTERESTED
(ENTIRE SET)* (*split up) before D (daughter)
DOWN
1. Bargain hunter finding fish higher in price! (7,2)
SNAPPER UP
SNAPPER (fish) + UP (higher in price)
2. Old academic flipped over introduction of standardised tests (5)
EXAMS
EX (old) + (MA)< (academic, <flipped) over S[tandardised] (introduction of)
3. Pity each revolutionary’s grief (9)
HEARTACHE
HEART (pity) + (EACH)* (*revolutionary)
4. Experiencing a spell of good luck when student managed to block toilet up (2,1,4)
ON A ROLL
(L (student) + (RAN (managed) to block LOO (toilet)))< (<up)
5. German porkies describing soldiers’ triumphs (7)
GLORIES
(G (German) + LIES (porkies)) describing OR (soldier)
7. Relating to a religious movement of friars at a bash (9)
RASTAFARI
8. Maiden cutting a little flower (5)
SOMME
M (maiden) cutting SOME (a little)
11. Evident in Robin’s charm (3)
OBI
15. Become extremely agitated and tense after literary Lorna’s letter (2,4,3)
DO ONES NUT
T (tense) after (DOONES (literary Lorna’s) + NU (letter))
17. That baked dish included in South Carolina exhibition primarily as a fine example of its type (9)
SHOWPIECE
(HOW (that) + PIE (baked dish)) included in (SC (South Carolina) + E[xhibition] (primarily))
18. Information turned over by the French court newspaper boss disregarded (9)
NEGLECTED
(GEN)< (information, <turned over) by LE (the, French) + CT (court) + ED (newspaper boss)
20. Think at length of Spanish gentleman keeping in good health (5,2)
DWELL ON
DON (Spanish gentleman) keeping WELL (in good health)
21. Of fundamental importance to mention diagram of identification at the front (7)
KEYNOTE
NOTE (mention), KEY (diagram of identification) at the front
22. Understood by Italian leader engaged in diplomacy (5)
TACIT
I[talian] (leader) engaged in TACT (diplomacy)
23. Copper meeting resistance from scoundrel (3)
CUR
CU (copper) meeting R (resistance)
25. Modify American person’s home over time (5)
ADAPT
A (American) + (PAD)< (person’s home, <over) + T (time)
The high number of envelope clues made this puzzle a relatively kind solve overall, just right for a Monday.
Still, I needed to check the blog to confirm/clarify the full parsing of 3 and 9.
My favourite was the literary DO ONE’S NUT.
11’s ‘charm’ could only be OBI but that would be ‘obi-kazari’ while ‘obi’ on its own refers to the wide sash worn around the kimono-wearer’s middle rather than the charm (‘kazari’) suspended from it. Of importance to a friend of mine who specializes in the art of the kimono but of minor note only here in crosswordland.
An enjoyable offering.
Thanks to Peto and Teacow.
In Chambers, obi meaning ‘charm/fetish’ is listed as a separate meaning to ‘sash’.
I initially parsed HEARTACHE as in blog but preferred ‘A’ for ‘each’ + CHE for ‘revolutionary’.
If it’s in the dictionary, fair enough…