Captain's position in game (6)
I believe the answer is:
bridge
I believe this clue is a double definition.
'captain's position' is the first definition.
'game' is the second definition.
(bridge is a kind of game)
'in' is the link.
(Other definitions for bridge that I've seen before include "Card-game" , "English composer" , "Game; cross (river)" , "Captain's area on a ship" , "One on the fiddle" .)