Flirtatious gesture
I believe the answer is:
wink
'flirtatious gesture' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for wink that I've seen before include "Friendly eye movement" , "Conspiratorial eye movement" , "Lower eyelid briefly" , "Sleep moment; twinkle" , "It may be tipped" .)