Throw without an ace in card game (7)
I believe the answer is:
canasta
'card game' is the definition.
(canasta is a kind of card game)
'throw without an ace' is the wordplay.
'throw' becomes 'cast' (synonyms).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'ace' becomes 'a'.
'cast' placed around 'an' is 'canast'.
'canast'+'a'='CANASTA'
'in' is the link.
(Other definitions for canasta that I've seen before include "Card game like rummy" , "this needs two packs" , "Card game of the rummy family" , "Card game -- as an act (anag)" , "Card game resembling rummy" .)