Spanner needed for a game of cards (6)
I believe the answer is:
bridge
I believe this clue is a double definition.
'spanner' is the first definition.
(I've seen this before)
'a game of cards' is the second definition.
(bridge is a card game)
'needed for' acts as a link.
(Other definitions for bridge that I've seen before include "British composer" , "Structure carrying a road, railway etc." , "Can be contract or cantilever" , "Four-handed card game" , "may involve suspension" .)