Striker in game of soccer, say (5)
I believe the answer is:
match
I believe this is a double definition.
'striker' is the first definition.
(a match can be struck)
'game of soccer say' is the second definition.
(football match)
'in' acts as a link.
(Other definitions for match that I've seen before include "Equal - lucifer" , "Alliance" , "Correspondence" , "of little use when floodlights fail?" , "Lighter; contest" .)