Ironically mocking (9)
I believe the answer is:
sarcastic
'ironically mocking' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sarcastic that I've seen before include "Ironically mocking" , "Using mocking wit" , "Pungent" , "Mockingly ironic" , "Cruelly ironical" .)