Ale supplier uses British jug (6)
I believe the answer is:
brewer
'ale supplier' is the definition.
'british jug' is the wordplay.
'british' becomes 'br' (abbreviation for British).
'jug' becomes 'ewer' (type of vessel).
'br'+'ewer'='BREWER'
'uses' is the link.
(Other definitions for brewer that I've seen before include "one needing teapot?" , "Producer of beer" , "work I supply to pubs" , "Bitter maker?" , "I make tea" .)