Bar returns from riotous feast (5)
I believe the answer is:
revel
'riotous feast' is the definition.
(I've seen this before)
'bar returns' is the wordplay.
'bar' becomes 'lever' (lever is a kind of bar).
'returns' says the letters should be written in reverse.
'lever' reversed gives 'REVEL'.
'from' is the link.
(Other definitions for revel that I've seen before include "Take great delight (in)" , "Celebrate noisily" , "Spree" , "Have a few drinks etc." , "Paint the town red" .)