ACROSS
 8. <circumvented restrictions on> JAILBROKE = →"BRAILLE JOKE"←
 9. S out of SUP + PER = UPPER <stimulant>
10. <singer> CROONER = CR _O_ + ONER
11. <quickly moving> YANKING = ←NAY← + KING
12. SW1 S_S = SWISS <from European nation>
13. <online retailer> E-BUSINESS = (.u)EBUS IN ESS(e.)
16. <Christian> EASTERN ORTHODOX = EASTER + NORTH O DO X
19. T_ W_ + INKLING = TWINKLING <flash>
21. <flower> TULIP = _UL_ inside TIP
23. GAT + WICK = GATWICK <London airport>
25. <skip the details> SPARE ME = SPA + REME
26. <one drying> TOWEL = TO_ WEL_
27. <transmitter> NERVE CELL = NE CLEVER* _L

DOWN
 1. <green liqueur> MIDORI = MID OR I
 2. <meat> T-BONE STEAK = TB + ONE'S TEA + K
 3. <figure> FOURTEEN = ROUTE* inside FEN
 4. "CU" = SEE YOU <goodbye>
 5. "TERN" = TURN <wind>
 6. <bad hair> SPLIT END = D after (SLEPT IN)*
 7. R inside BIG = BRIG <prison>
 8. <fish> JACKSMELT = JACKS MELT
14. (ART WITH ONE)* = IN HOT WATER <facing danger>
15. <it> SEX APPEAL = ←AXES← APPLE
17. SKI + PT OWN = SKIP TOWN <run away>
18. <official records> REGISTRY = RE GIS + TRY
20. IN KING = INKING <giving tattoos>
22. LIES outside EG = LIEGES <lords>
23. G_U_T _S = GUTS <courage>