Judge terribly irate with gutless barrister (7)
I believe the answer is:
arbiter
'judge' is the definition.
(I know that arbiter is a type of judge)
'terribly irate with gutless barrister' is the wordplay.
'terribly' indicates an anagram.
'with' means one lot of letters go next to another.
'gutless' means to remove the middle letters.
'barrister' with its centre removed is 'br'.
'irate' put after 'br' is 'brirate'.
'brirate' is an anagram of 'ARBITER'.
(Other definitions for arbiter that I've seen before include "Settler of disputes" , "Judge, adjudicator" , "Judge - mediator" , "One must exercise judgment" , "One has the authority to resolve disputes" .)