Call, as a game (3)
I believe the answer is:
ref
'call as a game' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ref that I've seen before include "A diminutive umpire in soccer or boxing" , "Middleman needing cards" , "In brief, a soccer controller" , "Sports umpire" , "'Game judge, in short (3)'" .)