Morally justifiable (9)
I believe the answer is:
righteous
'morally justifiable' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for righteous that I've seen before include "Morally justified" , "Good!" , "Virtuous, free from sin or guilt" , "Morally justifiable, or people who behave thus" , "Just, upright" .)