Bridge: card game (7)
I believe the answer is:
pontoon
I believe this is a double definition.
'bridge' is the first definition.
(pontoon is a type of bridge)
'card game' is the second definition.
(pontoon is a card game)
(Other definitions for pontoon that I've seen before include "Floating bridge support" , "Card game; floating support" , "Gambling game" , "Bridge of boats" , "Half of 1D [GAME OR BIRD]" .)