Show scorn (5)
I believe the answer is:
sneer
'show scorn' 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 "Taunt" , "Scoff, scorn" , "Curl one's lip" , "Show contempt by contorting the face" , "Contemptuous or mocking smile" .)