A game - that's what a striker needs (5)
I believe the answer is:
match
'a game' is the definition.
(eg a football match)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for match that I've seen before include "Sporting event" , "Equal contender" , "Suit; fixture" , "Partnership" , "one's struck" .)