Card game requiring absurd caution: cross! (7,6)
I believe the answer is:
auction bridge
'card game' is the definition.
(auction bridge is a kind of card game)
'absurd caution cross' is the wordplay.
'absurd' indicates an anagram.
'cross' becomes 'bridge' (bridging is a kind of crossing).
'caution' is an anagram of 'auction'.
'auction'+'bridge'='AUCTION BRIDGE'
'requiring' acts as a link.
(Other definitions for auction bridge that I've seen before include "Four - handed card game" , "Game superseded by 1 down" , "Card game now superseded by contract" .)