Senator is changing profession (9)

I believe the answer is:

assertion

'profession' is the definition.
(thesaurus)

'senator is changing' is the wordplay.
'changing' indicates anagramming the letters.
'senator'+'is'='senatoris'
'senatoris' anagrammed gives 'ASSERTION'.

(Other definitions for assertion that I've seen before include "Confident declaration" , "Confident statement of fact" , "Claim" , "Emphatic declaration" , "Notarises (anag)" .)

I've seen this clue in The Telegraph.

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