Canada’s ratable system (7)

I believe the answer is:

alberta

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'canada's' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'ratable system' is the wordplay.
'ratable' anagrams to 'ALBERTA'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for alberta that I've seen before include "Banff province" , "Canadian province, capital Edmonton" , "region of North America" , "Province of W. Canada" , "Where is Jasper" .)

I've seen this clue in the Evening Standard.

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