Lover who was for one summer in France an interpreter (7)
I believe the answer is:
exegete
'interpreter' is the definition.
(I've seen this before)
'lover who was for one summer in france' is the wordplay.
'lover who was' becomes 'ex' (ex-lover).
'for one' becomes 'eg' (both can mean 'for example').
'summer in france' becomes 'ete' (').
'ex'+'eg'+'ete'='EXEGETE'
'an' is the link.
(Other definitions for exegete that I've seen before include "Interpreter of scripture" , "commentator" , "scriptural interpreter" .)