Knock down all skittles, wrong when set up for game (4,6)

'game' is the definition.
(I know that deck tennis is a type of court game)

'knock down all skittles wrong when set up' is the wordplay.
'knock down' becomes 'deck' (deck can mean to knock over).
'all skittles' becomes 'ten' (eg all ten skittles in ten-pin bowling).
'wrong' becomes 'sin' (wrong can mean a sin or crime).
'when set up' says the letters should be written backwards (in a down clue, letters go up).
'sin' backwards is 'nis'.
'deck'+'ten'+'nis'='DECK-TENNIS'

'for' is the link.