Striker needs security before game (6,5)
I believe the answer is:
safety match
'striker' is the definition.
(I've seen this before)
'security before game' is the wordplay.
'security' becomes 'safety' (I've seen this before).
'before' means one lot of letters go next to another.
'game' becomes 'match' (eg a football match).
'safety'+'match'='SAFETY-MATCH'
'needs' acts as a link.
(Other definitions for safety match that I've seen before include "Not a dangerous striker" , "limited striker" , "It needs a special surface to ignite" , "Home striker" , "light" .)