Requirement when the game finished finally (4)
I believe the answer is:
need
'requirement' is the definition.
(I know that need is a type of requirement)
'when the game finished finally' is the wordplay.
'finally' indicates one should take the final letters.
The last letters of 'when the game finished' are 'NEED'.
(Other definitions for need that I've seen before include "Penury" , "''A friend in .... is a friend indeed''" , "Require (as essential)" , "Distressful situation" , "state of distress" .)