Crossword Genius

North American province, not a different South American city (7)

Ross

I believe the answer is:

ontario

'north american province' is the definition.
(province of Canada)

'not a different south american city' is the wordplay.
'different' is an anagram indicator.
'south american city' becomes 'rio' (I've seen this before).
'not'+'a'='nota'
'nota' anagrammed gives 'onta'.
'onta'+'rio'='ONTARIO'

(Other definitions for ontario that I've seen before include "vast lake" , "Province of SE Canada, and a Great Lake" , "Most easterly Great Lake" , "Smallest of the Great Lakes" , "One of the Great Lakes" .)

I've seen this clue in The Guardian.
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