Banter easily wafted away (5)

I believe the answer is:

chaff

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'banter' is the definition.
(synonyms)

I don't understand the rest of the clue.

(Other definitions for chaff that I've seen before include "It's separated from wheat during threshing" , "Husks - jokes" , "Light-hearted banter" , "something worth little" , "Refuse from threshing" .)

I've seen this clue in the Evening Standard.

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