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