Stared angrily (6)
I believe the answer is:
glared
'stared angrily' is the definition.
('glare' can be a synonym of 'stare angrily')
This is all the clue.
(Other definitions for glared that I've seen before include "Lowered" , "Was too bright" , "Stared fiercely" , "Looked angrily" , "Glowered" .)