Some Mexican a star in game (7)
I believe the answer is:
canasta
'game' is the definition.
(canasta is a kind of game)
'some mexican a star' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'CANASTA' is hidden within 'mexican a star'.
'in' is the link.
(Other definitions for canasta that I've seen before include "Game played with two packs of cards and jokers" , "Can a staff cook stomach game?" , "Card game resembling rummy" , "series of hands" , "Two-pack card game" .)