Look displeased (5)
I believe the answer is:
frown
'look displeased' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for frown that I've seen before include "Facial expression of dislike or concentration" , "Look displeased" , "Sullen look" , "Furrow one's brow" , "Disapproving look" .)