The Spanish bar John Turner, perhaps (7)
I believe the answer is:
cantina
'the spanish bar' is the definition.
(I've seen this before)
'john turner perhaps' is the wordplay.
'john' becomes 'can' (synonyms).
'turner perhaps' becomes 'tina' (Tina Turner).
'can'+'tina'='CANTINA'
(Other definitions for cantina that I've seen before include "Bar in Spain (or Star Wars)" , "Concern for drinkers" , "rural Mexican bar" , "Spanish bar; Italian wine shop" , "Spanish wine-shop" .)