Pontoon (9)
'pontoon' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for vingt-et-un that I've seen before include "Pontoon (French)" , "Pontoon, or blackjack" .)
'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" .)
(Other definitions for blackjack that I've seen before include "2 8 [CASINO GAME]" , "A card game in which the object is to beat the bank" , "Vingt-et-un - pirates' ensign" , "Gambling card game" , "Casino card game" .)