Two things needed for tennis or other sport (7)
I believe the answer is:
netball
'sport' is the definition.
(netball is a sport)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for netball that I've seen before include "Team game, played mainly by women" , "activity no longer associated solely with girls" , "Sport whose players wear bibs" , "Game for women or girls" , "After this, you get to serve again" .)