Look daggers (5)
I believe the answer is:
glare
'look daggers' 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 "Blinding light" , "Angry look" , "Glower" , "Stare fiercely - 5 down (anag)" , "Angry stare" .)