Striker takes position for game's critical moment (5,5)
I believe the answer is:
match point
'striker takes position' is the definition.
I can't tell whether this defines the answer.
'game's critical moment' is the wordplay.
'game' becomes 'match' (eg a football match).
'critical moment' becomes 'point' (a point in time. I am not sure about the 'critical' bit.).
'match'+'point'='MATCH-POINT'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for match point that I've seen before include "One serve away from victory" , "One scored at bridge, perhaps" , "Decisive moment in game" , "could lead to victory in court" , "that may bring victory" .)