Chain to a province (7)

I believe the answer is:

alberta

'province' is the definition.
(province 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 "part of Canada" , "Where is Jasper" , "Province of W. Canada" , "North American province" , "Bale rat out of Canada" .)

I've seen this clue in The Daily Express.

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