It floats a card game (7)

I believe the answer is:

pontoon

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'card game' is the definition.
(pontoon is a card game)

I don't understand how the remainder of the clue works.

(Other definitions for pontoon that I've seen before include "Card game; float" , "Floating bridge support" , "'Flat-bottomed boat, card game and Mayo town (7)'" , "Bridge of boats" , "Blackjack" .)

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

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