Judge hopes to reform this man (6)
I believe the answer is:
joseph
'this man' is the definition.
'judge hopes to reform' is the wordplay.
'judge' becomes 'j' (abbreviation for judge).
'to reform' indicates an anagram (letters in a new form).
'hopes' with letters rearranged gives 'oseph'.
'j'+'oseph'='JOSEPH'
(Other definitions for joseph that I've seen before include "Lloyd Webber musical hero" , "Biblical character with amazing dreamcoat on stage" , "Biblical dreamcoat wearer" , "subject of musical" , "Name" .)