Change of Ontario address (7)

I believe the answer is:

oration

'address' is the definition.
(I know that oration is a type of oratory)

'change of ontario' is the wordplay.
'change of' indicates an anagram.
'ontario' is an anagram of 'ORATION'.

(Other definitions for oration that I've seen before include "A long ceremonial speech" , "A formal or ceremonial speech" , "words" , "Making a speech" , "An eloquent speech" .)

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

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