Cut short a game of cards (7)
I believe the answer is:
abridge
'cut short' is the definition.
(I've seen this before)
'a game of cards' is the wordplay.
'game of cards' becomes 'bridge' (I've seen this before).
'a'+'bridge'='ABRIDGE'
(Other definitions for abridge that I've seen before include "Make short work" , "Shorten for e.g. radio" , "Shorten written work" , "Remove sections" , "Make shorter, book say" .)