Ill fortune covering sport (9)
I believe the answer is:
badminton
'sport' is the definition.
(I know that Badminton is a type of court game)
'ill fortune covering' is the wordplay.
'ill' becomes 'bad' (similar in meaning).
'fortune' becomes 'mint' (making a mint is making a lot of money).
'covering' becomes 'on'.
'bad'+'mint'+'on'='BADMINTON'
(Other definitions for badminton that I've seen before include "A sport; Beaufort seat" , "Racket sport" , "One sport" , "Game played with a shuttlecock" , "Game played with rackets" .)