Ogling the French sweetheart with girdle (7)
I believe the answer is:
leering
'ogling' is the definition.
(I've seen this before)
'the french sweetheart with girdle' is the wordplay.
'the french' becomes 'le' ('the' in French).
'sweetheart' becomes 'e' (the heart/centre of 'sweet').
'with' means one lot of letters go next to another.
'girdle' becomes 'ring' (both can mean to surround).
'le'+'e'+'ring'='LEERING'
(Other definitions for leering that I've seen before include "giving the glad eye" , "Ogling" , "Looking suggestively" , "appearing lascivious" , "Gazing lasciviously" .)