Judge irate brat needs correction (9)
I believe the answer is:
arbitrate
'judge' is the definition.
(to arbitrate is to judge or decide)
'irate brat needs correction' is the wordplay.
'needs correction' is an anagram indicator (I've seen 'needing correction' mean this (I've seen this in other clues)).
'irate'+'brat'='iratebrat'
'iratebrat' anagrammed gives 'ARBITRATE'.
(Other definitions for arbitrate that I've seen before include "Help settle a dispute" , "Decide" , "Adjudge" , "Act between disputing parties" , "Mediate" .)