Ridiculing (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
mocking
'ridiculing' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for mocking that I've seen before include "Raillery" , "Scornfully teasing, ridiculing" , "Taunting" , "Sarcastic" .)