The ring of righteousness (4)
I believe the answer is:
halo
This clue might be a double definition.
'the ring' is the first definition.
(synonyms)
'righteousness' is the second definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'of' is the link.
Can you help me to learn more?
(Other definitions for halo that I've seen before include "Light around sun, saint" , "Ring of light (signifying holiness)" , "that could make one light-headed?" , "Ring (around sun or moon)" , "Luminous ring" .)