Contemptuous look (5)
I believe the answer is:
sneer
'contemptuous look' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sneer that I've seen before include "Express cynical contempt" , "A scornful expression or remark" , "Contemptuous remark" , "Show contempt by contorting the face" , "Derisive remark" .)