Willing to indicate imminent victory (4,5)
I believe the answer is:
game point
'imminent victory' is the definition.
The definition suggests a singular noun which matches the answer.
'willing to indicate' is the wordplay.
'willing' becomes 'game' (game can mean willing to do something).
'to indicate' becomes 'point' ('point' can be a synonym of 'indicate').
'game'+'point'='GAME POINT'
Can you help me to learn more?
(Other definitions for game point that I've seen before include "Decisive moment" , "advantage possibly" .)