Grouchy look (5)
I believe the answer is:
scowl
'grouchy look' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for scowl that I've seen before include "Glower; frown" , "Lower" , "Angry frown" , "Angry facial expression" , "Bad-tempered expression" .)