Ringing in relation to (5)
I believe the answer is:
about
This could be a double definition.
'ringing' is the first definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'in relation to' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for about that I've seen before include "In conection with, all around" , "Close to" , "Not exactly - concerning" , "Approximately, around" , "Encompassing" .)