Look daggers (at) (5)
I believe the answer is:
glare
'look daggers at' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for glare that I've seen before include "Large (anag.)" , "Glower" , "fierce look" , "Scowl angrily" , "Stare angrily" .)