Referee
'referee' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for arbiter that I've seen before include "He'll decide" , "One appointed to settle a dispute" , "Settler of dispute" , "Judge, final authority" , "One judges a disputed issue" .)
'referee' is the definition.
(I know that umpire is a type of referee)
This is all the clue.
(Other definitions for umpire that I've seen before include "Arbitrator (in certain sports)" , "Football official" , "Kind of referee as in cricket" , "Arbiter of cricket match" , "Adjudicator in games such as cricket, tennis etc" .)
'referee' is the definition.
(I know that referee is a kind of judge)
This is all the clue.
(Other definitions for adjudicate that I've seen before include "Adjudge" , "Decide between contestants" , "Judge" , "Referee" , "Decide officially on a dispute" .)