Take an inch off a bird's tail for fun (5)

I believe the answer is:

chaff

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'fun' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for chaff that I've seen before include "It's separated from wheat during threshing" , "Rubbish" , "Winnowed husks of grain" , "Husks - jokes" , "Refuse - banter" .)

I've seen this clue in the Evening Standard.

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