Chain to a part of Canada (7)

I believe the answer is:

alberta

'part of canada' is the definition.
('Alberta' is part of 'canada')

'chain to a' is the wordplay.
'chain' becomes 'albert' (I've seen this before).
'albert'+'a'='ALBERTA'

(Other definitions for alberta that I've seen before include "Province of W. Canada" , "Canadian province, capital Edmonton" , "Ratable (anag)" , "North American province" , "Banff province" .)

I've seen this clue in The Daily Express.

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