ACROSS
 1. (MORAL CADS)* = RASCALDOM <place of rogues>
 6. <coastal feature> BIGHT = BIG HT
 9. <white> CHABLIS = CHA (L I inside BS)
10. ←(.x)I MAN U ST(r.)← = TSUNAMI <wave>
11. <actress> VANESSA REDGRAVE = (EVANS DARES)* GRAVE
13. R_ A_ D_ I_ O_ = RADIO <wireless tech>
14. <series> TRILOGIES = TRIES outside I LOG
17. (SISTER SAD)* = DISASTERS <terrible events>
19. ABLE after S = SABLE <weasel-like mammal>
21. <here, jot down> COMMONPLACE BOOK = COMM ON PLACEBO OK
23. PLAN outside _Y_ PE = PLAYPEN <where kids can have fun>
24. LAMBDA outside A = LAMBADA <Brazilian dance>
26. <kebab> DONER = DONE R
27. SHY outside RUBBER = SHRUBBERY <flora>

DOWN
 1. <better> RECOVERED = REED outside COVER
 2. <generated> SPAWNED = _S PAWNED
 3. AWOL - _O_ = AWL <boring tool>
 4. <demolish> DISMANTLE = NT inside DISMAL _E
 5. <dull> MATTE = MATTE[-r]
 6. BOSIE outside (URGE + O _I_) = BOURGEOISIE <conventional group>
 7. GUARAN[-tee] + I = GUARANI <money in Paraguay>
 8. T + WINE = TWINE <thread>
12. <impressive display> SHOWSTOPPER = →"STOW SHOPPER"←
15. (IS outside N) TALLER = INSTALLER <wizard?>
16. _EAKE_ _AS_ inside SPY = SPEAKEASY <illegal saloon>
18. S_A_M _H_ A_I_N = SAMHAIN <festival in November>
20. C inside BROADE[-n] = BROCADE <heavy fabric>
21. CID outside UP = CUPID <lover-boy?>
22. <rubbish> PANTS = PATS outside N
25. <syndicate> MOB = MO B_