ACROSS
 7. <way to keep food> TUPPERWARE = WATER* outside UPPER
 9. <imitation> ECHO = (.t)E CHO(c.)
10. ANTI CS = ANTICS <tomfoolery>
11. CU PB ROD* outside A = CUPBOARD <cabinet>
12. <bother> DARN <to repair fabric>
14. <one advising> COUNSELLOR = CO + UN SELL OR
16. <state> POLITY = POLY outside IT
17. <cooler> AIR-CON = AI RC ON
20. {it's polite to yawn here} BEHIND HAND = BEHINDHAND <late>
22. <stone> ONYX = O + NY X
23. PI'S STAKE = PISS-TAKE <farce>
25. <arrested> CAUGHT = "COURT"
27. J + INN = JINN <spirit>
28. <novel> EAST OF EDEN = ((DEFOE SET)* outside A) N

DOWN
 1. <insult> BURN = BUN outside R
 2. OPT + IONA L = OPTIONAL <up to you?>
 3. PROSE CUT + ED = PROSECUTED <brought before judge>
 4. ←PUER← = RE-UP <to get more drugs>
 5. ←LOOTER← = RETOOL <gear again>
 6. <wine> CHARDONNAY = C_ HARD-ON NAY
 8. <get> ACCRUE = A CC + RUE
13. A (TIPPLES IN)* = APPLETINIS <cocktails>
15. <PR expert> SPIN DOCTOR => ←MD← {instruction for writing DM?}
18. <sang> CHORUSED = CE D_ outside HORUS
19. <small roles> CAMEOS = CAME + O_S
21. INS Y_ N_ C_ = IN SYNC <on the same page>
24. <god> ARES = _A_R_E_S
26. <bad guy> HEEL = "HEAL"