ACROSS
8. (...b)ORATOR I O(u...) = ORATORIO <work>
9. N inside FIERY = FINERY <showy clothing>
10. <clerics> IMAMS = JIMJAMS - JJ
11. <Protestants> HUGUENOTS = HUG U ←STONE←
13. <detailed> SPECIFIED = ←DEIFIC EPS←
14. GLAM outside E = GLEAM <glitter>
16. (ORGANISE WRITTEN)* = ROARING TWENTIES <decades>
19. <cheer> ELATE = EE outside (-f)LAT(-s)
21. <lawyer> LITIGATOR = LIT I GATOR
23. (TEA MISSED)* = DEMITASSE <small cup>
24. <rest> LIE-IN = __L__I__ E__I__N_
25. GENTS after A = AGENTS <spies>
26. CAMO LIME* = CAMOMILE <tea>

DOWN
1. ROTI ⭯SERIES⭯ = ROTISSERIE <cooker>
2. HA + BAN ERA = HABANERA <dance>
3. <tree> BONSAI = AI under ←SNOB←
4. <singers> NIGHTINGALES = KNIGHTING WALES - K_ W_
5. <hit man> HIRED GUN = (RUING HED)*
6. BEG ONE = BEGONE <go away>
7. "BUYS" = BYES <expedited qualifications?>
12. GOD (W PANTHEON)* = GO DOWN THE PAN <founder>
15. ←IM← SPRINTED = MISPRINTED <published incorrectly>
17. <legal name> IDENTITY = ID ENTITY
18. <included> IN THE MIX = I NIX outside THEM
20. <hosts> ARMIES = ARIES outside M
22. ←POLL AG← = GALLOP <run>
23. <trade> DEAL <timber that's easily sawn>