Sneer at, taunt (6)
I believe the answer is:
deride
This clue is a double definition.
'sneer at' is the first definition.
(I've seen this in another clue)
'taunt' is the second definition.
(I've seen this in another clue)
(Other definitions for deride that I've seen before include "Test performance" , "'Mock, sneer at (6)'" , "Express contempt for" , "Mock, scorn" , "Speak of with contempt" .)