Stare impertinently (4)
I believe the answer is:
ogle
'stare impertinently' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ogle that I've seen before include "Look at lecherously" , "Look at inappropriately" , "Gape at" , "Cast flirtatious glance at" , "Give the glad eye" .)