Jeering, mocking (8)
I believe the answer is:
taunting
I believe this clue is a double definition.
'jeering' is the first definition.
(I know that jeering can be written as taunting)
'mocking' is the second definition.
(I know that mocking can be written as taunting)
(Other definitions for taunting that I've seen before include "Baiting" , "Attuning to jeering mode" , "Teasing unpleasantly" , "Jeering, mocking" .)