Card game shown in British newspaper (4)
I believe the answer is:
brag
'card game' is the definition.
(I've seen this before)
'british newspaper' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'newspaper' becomes 'rag' (rag is a kind of newspaper).
'b'+'rag'='BRAG'
'shown in' acts as a link.
(Other definitions for brag that I've seen before include "Boast about garb" , "Boast, crow" , "game, making > boast" , "popular with 15 [EGOTIST] , no doubt" , "Boast, exaggerate" .)