Drunkenly set trap for the barman (7)
I believe the answer is:
tapster
'the barman' is the definition.
(tapster is a kind of barman)
'drunkenly set trap' is the wordplay.
'drunkenly' indicates anagramming the letters.
'set'+'trap'='settrap'
'settrap' anagrammed gives 'TAPSTER'.
'for' acts as a link.
(Other definitions for tapster that I've seen before include "Old barperson" , "Bar employee" , "Bartender once" , "Rat pest (anag.)" , "old barman" .)