Legal man rings the changes on treaty (8)

I believe the answer is:

attorney

I'm a little stuck... Click here to teach me more about this clue!

'legal man rings the' is the definition.
I can't judge whether this defines the answer.

'changes on treaty' is the wordplay.
'changes' indicates anagramming the letters.
'on'+'treaty'='ontreaty'
'ontreaty' anagrammed gives 'ATTORNEY'.

Can you help me to learn more?

(Other definitions for attorney that I've seen before include "Person legally authorised to act for another" , "One legally acting for another" , "No treaty (anag.)" , "Person appointed to act for another in legal or business matters" , "Person legally appointed to act for another" .)

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.