Hostile look (5)
I believe the answer is:
glare
'hostile look' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for glare that I've seen before include "Stare fiercely - 5 down (anag)" , "Stare angrily" , "fierce look" , "Shine intensely" , "Large (anag.)" .)