Fifteensquared

KATZENJAMMER or GUEULE DE BOIS - A hangover in any language from this alcoholic puzzle with drinks
 from many lands.  At least it ended with a coffee!  Only 20A was a new word for me  and there were no bones of contention  as far as I  could see.

ACROSS

1.      ADAM’S ALE - (a-dam -sale )
5.      SCOTCH -(s-cot-ch)
10.    CIDER - ( d within *rice)
11.    SMALL BEER - ( dd)
12.    SHORT LIST - ( cd)
13.    STEIN -( st - ein (German for ‘a’ masc.)
14.    SYPHON - ( sAYING -yES-phonE)-
15.    COOPERS - (’o’ within ‘copers’, people who manage.  Craftsmen who make barrels).
18.    CLEAN UP - (dd)
20.    PULQUE - (<up-l-que ( Spanish for ‘what?’  Memories of Manuel!) A Mexican alcoholic drink, made from fermented fruit juice.)
22.    PUMPS - (ps around u-mp)
24.    SOMMELIER - ( somme-l-i-er.  Continuing the drinks theme, a wine steward.)
25.    RACKETEER - ( racket-eer)
26.    INANE - (hidden in ‘in an eMERGENCY’)
27.    SHANDY - ( s-handy)
28.    STAGGERS - ( dd)
DOWN

1.      ACCOST. ( a-c-cost - to do something at great cost)
2.     ANDROGYNE -( *Donna Grey - a person of ambiguous gender)
3.     SCRATCH  ONE’S  HEAD -( dd)
4.     LESBIAN - ( le-*banis - Sappho was born in Lesbos)
6.     COLD SHOULDERING - ( cold-shoulder-in-g.  cd.)
7.     THEME - ( t-hem-e)
8.     HARDNESS - ( ‘d’EFENDERS within ‘harness’)
9.     MASTIC - ( ma’s ticK)
16.   ELUCIDATE - ( *clue-i-date)
17.   SCEPTRES - ( *secrets with p-RESSURE)
19.   POSSET- ( pos-se-t. A hot drink usually made with milk heated with wine)
20.   POMFRET - ( pom-fret. various species of fish from North Atlantic and Pacific. Australians refer to Brits as Poms,usually of the whingeing variety.)
21.   ORDERS - B-orders)
23.   MOCHA - (mo-cha)