Rubbing out some of card game? (5)
I believe the answer is:
bingo
'card game?' is the definition.
(I've seen this in another clue)
'rubbing out some' is the wordplay.
'some' indicates the answer is hidden within the clue.
'BINGO' is hidden within 'rubbing out'.
'of' acts as a link.
(Other definitions for bingo that I've seen before include "Game in which "two little ducks" might be called" , "Number-calling game" , "House!" , "Game of chance" , "I've completed my card!" .)