Bishop's warning about a prairie province (7)

I believe the answer is:

alberta

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'prairie province' is the definition.
'alberta' can be an answer for 'province' (province of Canada). I'm not sure about the 'prairie' bit.

'bishop's warning about a' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'warning' becomes 'alert' (alert is a kind of warning).
'about' indicates putting letters inside.
'b' inserted into 'alert' is 'albert'.
'albert'+'a'='ALBERTA'

Can you help me to learn more?

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

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