Cut short a card game (7)
I believe the answer is:
abridge
'cut short' is the definition.
(to abridge something is to make it shorter)
'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 "Concentrate" , "Shorten for e.g. radio" , "Edit down" , "Abbreviate, shorten" , "Make shorter in brigade" .)