Snub in game (6)
I believe the answer is:
squash
I believe this is a double definition.
'snub' is the first definition.
(both can mean to repress or put down)
'game' is the second definition.
(squash is a kind of game)
'in' acts as a link.
(Other definitions for squash that I've seen before include "In which one serves" , "Vegetable, drink and ball game" , "Orange drink" , "Racket and ball game and a fruit" , "Cordial drink" .)