...in classy bar, it excites hedonist (8)
I believe the answer is:
sybarite
'hedonist' is the definition.
(thesaurus)
'in classy bar it excites' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SYBARITE' is hidden within 'classy bar it excites'.
(Other definitions for sybarite that I've seen before include "Hedonist" , "Lover of luxury" , "Self-indulgent person" , "Seeker after luxury" , "Person excessively fond of luxury and comfort" .)