Cricket arbiter (6)
I believe the answer is:
umpire
'cricket arbiter' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for umpire that I've seen before include "The ref in cricket match" , "A field judge in circket" , "Official at a cricket match" , "Game judge" , "Adjudicator in games such as cricket, tennis etc" .)