Link in card game? (6)
I believe the answer is:
bridge
This clue is a double definition.
'link' is the first definition.
(both can mean to join or connect)
'card game?' is the second definition.
(I know that bridge is a card game)
'in' acts as a link.
(Other definitions for bridge that I've seen before include "Crossing structure" , "Join" , "Captain's place on ship" , "Pontoon is one" , "One on the fiddle" .)