Joker perhaps against wit (7-4)

I believe the answer is:

playing-card

'joker perhaps' is the definition.
(joker is an example)

'against wit' is the wordplay.
'against' becomes 'playing' (as in two teams playing against each other).
'wit' becomes 'card' (synonyms).
'playing'+'card'='PLAYING-CARD'

I've seen this clue in The Telegraph.

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