Referee (6)
'referee' is the definition.
(I've seen this before)
This is all the 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.
(referee can mean to mediate or moderate)
This is the entire clue.
(Other definitions for mediate that I've seen before include "Intervene, act as go-between" , "Act as negotiator or peacemaker" , "Act as intermediary" , "try to resolve dispute" , "Help resolve a dispute" .)
'referee' is the definition.
(I know that umpire is a type of referee)
This is the entire clue.
(Other definitions for umpire that I've seen before include "Impure (anag) - adjudicator" , "A field judge in circket" , "Impartial supervisor" , "One enforcing the rules in games" , "Sports official" .)
'referee' is the definition.
(I know that referee is a more specific form of judge)
This is all the clue.
(Other definitions for adjudicate that I've seen before include "Pronounce decision" , "Decide between contestants" , "Adjudge" , "Decide officially on a dispute" , "award" .)