Crossword Genius

Refuse to make fun of (5)

Ross

I believe the answer is:

chaff

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'refuse' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(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" .)

I've seen this clue in The Globe and Mail.
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