A card in more senses than one (5)

I believe the answer is:

joker

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'a card' is the definition.
(joker is a type of playing card)

I don't understand the remainder of the clue.

(Other definitions for joker that I've seen before include "Funny man in pack" , "Playing card" , "Pack's extra card" , "Card - wag" , "trickster" .)

I've seen this clue in the Evening Standard.

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