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Just an old fool’s bit of fun! (4)

Ross

I believe the answer is:

jest

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'fun' is the definition.
(thesaurus)

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(Other definitions for jest that I've seen before include "Humorous remark" , "In ____, playfully" , "it's not serious, so to speak" , "Sally" , "Jape, witticism" .)

I've seen this clue in the Evening Standard.
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