Reel back at look (4)
I believe the answer is:
leer
'look' is the definition.
(leer is a kind of look)
'reel back' is the wordplay.
'back' says the letters should be written backwards.
'reel' written backwards gives 'LEER'.
'at' is the link.
(Other definitions for leer that I've seen before include "Ogle, smirk" , "Suggestive or sneering look" , "Look lecherously" , "unpleasant look" , "Stare suggestively" .)