Advocate any rot should be put right (6)
I believe the answer is:
notary
'advocate' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'any rot should be put right' is the wordplay.
'any rot' can be anagrammed to 'NOTARY'.
However, I am not clear how this is indicated.
Can you help me to learn more?
(Other definitions for notary that I've seen before include "Official authorised to witness document signing" , "Person legally authorised to witness signatures" , "Official authorised to witness signing of documents" , "One authorised to certify legal documents" , "Person legally empowered to witness signatures" .)