Card game that supports bridge (7)
I believe the answer is:
pontoon
This could be a double definition.
'card game' is the first definition.
(pontoon is a card game)
'supports bridge' is the second definition.
'pontoon' can be an answer for 'bridge' (pontoon is a type of bridge). I'm not sure about the 'supports' bit.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for pontoon that I've seen before include "Flat-bottomed boat supporting bridge" , "Gambling game" , "Card game - type of bridge" , "Floating bridge support" , "Vingt-et-un" .)