Lawyer working on treaty (8)

I believe the answer is:

attorney

'lawyer' is the definition.
(I know that lawyer can be written as attorney)

'working on treaty' is the wordplay.
'working' indicates anagramming the letters.
'on'+'treaty'='ontreaty'
'ontreaty' with letters rearranged gives 'ATTORNEY'.

(Other definitions for attorney that I've seen before include "Advocate" , "No treaty (anag.)" , "One legally acting for another" , "brief" , "One can help in case" .)

I've seen this clue in The Telegraph.

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