Exclude fellow drinks seller (6)
I believe the answer is:
barman
'drinks seller' is the definition.
'exclude fellow' is the wordplay.
'exclude' becomes 'bar' (synonyms).
'fellow' becomes 'man' (fellow can mean a man).
'bar'+'man'='BARMAN'
(Other definitions for barman that I've seen before include "One employed to serve" , "he might be responsible for you getting shot" , "He works in a pub" , "Pub employee" , "Bloke at counter" .)