Ritual banishment when former partner ignored (9)
I believe the answer is:
tradition
'ritual' is the definition.
(thesaurus)
'banishment when former partner ignored' is the wordplay.
I cannot quite see how this works, but
'when' could be 'on' (I've seen this in other clues) and 'on' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tradition that I've seen before include "Inherited custom" , "Custom, long-standing practice" , "Beliefs, etc, handed down" , "stuck in the old ways" , "Long-established custom or belief" .)