Crossword Genius

Medium body measurement not good fun (5)

Ross

I believe the answer is:

mirth

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'fun' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for mirth that I've seen before include "Laughter" , "Merriment" , "Amusement - jollity" , "Jocularity" , "funny feeling" .)

I've seen this clue in The Guardian.
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