Suggestive look (4)
I believe the answer is:
leer
'suggestive look' is the definition.
(a sexually suggestive look)
This is all the clue.
(Other definitions for leer that I've seen before include "Look suggestively" , "Lecherous look" , "Look lasciviously at" , "Ogle, smirk" , "Lascivious gaze" .)