Refuse to make fun of (5)
I believe the answer is:
chaff
'refuse' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for chaff that I've seen before include "Refuse - banter" , "Light banter - husks from corn" , "twit" , "Laugh at" , "It's separated from wheat during threshing" .)