Strong drink before my card game (5)
I believe the answer is:
rummy
'card game' is the definition.
(I know that rummy is a type of card game)
'strong drink before my' is the wordplay.
'strong drink' becomes 'rum' (rum is a kind of strong drink).
'before' means one lot of letters go next to another.
'rum'+'my'='RUMMY'
(Other definitions for rummy that I've seen before include "Peculiar - card game" , "with an alcoholic taste?" , "Odd; card-game" , "game of cards" , "Card game; strange; like a spirit" .)