Pub profit: good deal (7)
I believe the answer is:
bargain
'good deal' is the definition.
(I've seen this before)
'pub profit' is the wordplay.
'pub' becomes 'bar' (both are drinking establishments).
'profit' becomes 'gain' (synonyms).
'bar'+'gain'='BARGAIN'
(Other definitions for bargain that I've seen before include "Discuss terms for buying" , "Agreement; cheap item" , "Good buy" , "Cheap acquisition" , "Agreement, deal" .)