Crossword Genius

Vingt-et-un (7)

Ross

I believe the answer is:

pontoon

'vingt-et-un' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for pontoon that I've seen before include "Blackjack" , "variety of bridge" , "Card game; float" , "Bridge of boats" , "Card-game" .)

I've seen this clue in The Telegraph and The Sun.
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