Card game's deck controlled by captain (6)
I believe the answer is:
bridge
This clue might be a double definition.
'card game's' is the first definition.
(bridge is a kind of card game)
'deck controlled by captain' is the second definition.
'bridge' can be an answer for 'deck' (thesaurus). I'm not sure about the 'controlled by captain' bit.
Can you help me to learn more?
(Other definitions for bridge that I've seen before include "played by a quartet" , "A walkover" , "spanner" , "Structure carrying a road, railway etc." , "Something of a nose" .)