Princely part of Canada (7)

I believe the answer is:

alberta

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for alberta that I've seen before include "Banff province" , "region of North America" , "North American province" , "Canadian province, capital Edmonton" , "Einstein" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app