Dirty looks
I believe the answer is:
sneers
'dirty looks' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sneers that I've seen before include "Shows contempt by scornful expression" , "Shows scorn" , "Contemptuous or scornful remarks" , "Jeers, derides" , "Smiles contemptuously" .)