Judge’s target aims for change (10)
I believe the answer is:
magistrate
'judge's' is the definition.
(synonyms)
'target aims for change' is the wordplay.
'for change' is an anagram indicator (I've seen this in other clues).
'target'+'aims'='targetaims'
'targetaims' is an anagram of 'MAGISTRATE'.
(Other definitions for magistrate that I've seen before include "Law enforcer" , "your worship" , "JP" , "Judge" , "Dispenser of justice" .)