Disdainful look (5)
I believe the answer is:
sneer
'disdainful look' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sneer that I've seen before include "Show cynical contempt" , "Show contempt by contorting the face" , "A scornful expression or remark" , "Scoff, scorn" , "Speak scornfully" .)