Morally justified in reforming this rogue? (9)
I believe the answer is:
righteous
'morally justified' is the definition.
('righteous' can be similar in meaning to 'morally justified')
'reforming this rogue?' is the wordplay.
'reforming' is an anagram indicator.
'this'+'rogue'='thisrogue'
'thisrogue' with letters rearranged gives 'RIGHTEOUS'.
'in' is the link.
(Other definitions for righteous that I've seen before include "Morally justified" , "Morally justifiable, or people who behave thus" , "Showing virtue" , "Good!" , "Moral - virtuous" .)