Folly bust dairy, unfortunately (9)
I believe the answer is:
absurdity
'folly' is the definition.
(absurdity is a kind of folly)
'bust dairy unfortunately' is the wordplay.
'unfortunately' indicates anagramming the letters.
'bust'+'dairy'='bustdairy'
'bustdairy' with letters rearranged gives 'ABSURDITY'.
(Another definition for absurdity that I've seen is " Wild illogicality".)
I've seen this clue in The Times.
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