Righteous, high-principled (8)
I believe the answer is:
virtuous
I believe this clue is a double definition.
'righteous' is the first definition.
(associated in meaning)
'high-principled' is the second definition.
(thesaurus)
(Other definitions for virtuous that I've seen before include "Highly moral" , "Morally upright" , "Showing high moral standards" , "Upstanding" , "Morally good" .)