Entertain with revolting beer and ecstasy (6)
I believe the answer is:
regale
'entertain' is the definition.
(I've seen this in another clue)
'revolting beer and ecstasy' is the wordplay.
'revolting' is a reversal indicator.
'beer' becomes 'lager' (type of beer).
'and' means one lot of letters go next to another.
'ecstasy' becomes 'E' (informal term for the drug).
'lager' in reverse letter order is 'regal'.
'regal'+'e'='REGALE'
'with' acts as a link.
(Other definitions for regale that I've seen before include "Feed or entertain well" , "Entertain lavishly" , "Entertain royally" , "Generously entertain (with)" , "Lavishly supply" .)