Angry frown (5)
I believe the answer is:
scowl
'angry frown' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for scowl that I've seen before include "Angrily frown" , "Glower; frown" , "Angry facial expression" , "Gloomy or threatening expression" , "Look threatening" .)