Hedonistic nightspot gutted after the seventies? (8)
I believe the answer is:
decadent
'hedonistic' is the definition.
(I've seen this in another clue)
'nightspot gutted after the seventies?' is the wordplay.
'gutted' suggests removing the centre (to gut something is to remove its insides).
'after' is a charade indicator (letters next to each other).
'the seventies?' becomes 'decade' (seventies is a kind of decade).
'nightspot' with its centre removed is 'nt'.
'nt' after 'decade' is 'DECADENT'.
(Other definitions for decadent that I've seen before include "Reflecting a state of moral decline" , "Depraved" , "Morally corrupt" , "Dissolute and corrupt" , "Reprobate" .)