Gazing lasciviously (7)
I believe the answer is:
leering
'gazing lasciviously' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for leering that I've seen before include "appearing lascivious" , "Looking suggestively" , "Ogling" , "Gazing lasciviously" , "giving the glad eye" .)