Condense a card game (7)
I believe the answer is:
abridge
'condense' is the definition.
(I've seen this in another clue)
'a card game' is the wordplay.
'card game' becomes 'bridge' (bridge is a kind of card game).
'a'+'bridge'='ABRIDGE'
(Other definitions for abridge that I've seen before include "prune?" , "Concentrate" , "Curtail" , "Make a precis of" , "Condense, summarise" .)