Stupid jeer ruined witticism (3,7)
I believe the answer is:
jeu d'esprit
'witticism' is the definition.
(jeu d'esprit is a kind of witticism)
'stupid jeer ruined' is the wordplay.
'ruined' indicates anagramming the letters.
'stupid'+'jeer'='stupidjeer'
'stupidjeer' with letters rearranged gives 'JEU DESPRIT'.
(Another definition for jeu d'esprit that I've seen is " Light-hearted display of wit".)
I've seen this clue in The Times.
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