ACROSS
 1. <copy> DOPPELGANGER = PP inside (GOLDEN AGE)* + R
 9. TAPES after S_ = STAPES <stirrups>
10. <antique carriage> BROUGHAM = BROUGH[-t] A M
11. <cop> BLUEBOTTLE = BLUE BOTTLE
12. <spill the beans> LEAK = "LEEK"
13. P LAY + F AIR = PLAY FAIR <fiddle not at all>
16. <crisp> QUAVER <note>
17. T inside ACING = ACTING <stagecraft>
19. RHEA inside DOVE* = OVERHEAD <up above>
21. <downfall> RAIN = "REIGN"
22. INDUS + TRIAL = INDUSTRIAL <manufacturing>
25. T_ OWNS HIP = TOWNSHIP <urban area>
26. O + BORNE* = OBERON <Titania's husband>
27. <joke> SIDE-SPLITTER = ←DIS← ESP LITTER

DOWN
 2. <base> OCTAL = O_ C_ T_ A_ L_
 3. PEP PYRE* = PEPPERY <burning>
 4. (.l)L ASSO(c.) = LASSO <catcher>
 5. <one deciding> ARBITER = A ORBITER - _O
 6. <monstrous> GROTESQUE = (OGRE + QUEST)*
 7. ←A1 LAGER← = REGALIA <the crown and scepter?>
 8. MAC ARENA = MACARENA <dance>
14. <athlete> LUCHADOR = LUC_ HAD + OR
15. AN GUI + SHED = ANGUISHED <displaying grief>
18. <chance to score> INNINGS = WINNINGS - W
19. <Greek> OEDIPUS = OED I PUS[-h]
20. <gather e.g. rye> HARVEST = W out of WHARVES + T
23. <cylinder> SPOOL = ←LOOPS←
24. <came to> AWOKE = A+E outside WOK