Pontoon (5-2-2)

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9 5-2-2

6-3

twenty-one

'pontoon' is the definition.
(names for the same card game)

This is all the clue.

(Other definitions for twenty-one that I've seen before include "XXI - used to be the coming of age year" , "Target total in blackjack or pontoon" , "Card game, blackjack or pontoon" .)

I've seen this clue in The Telegraph and the Sydney Morning Herald.

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