Canada's main boat-building province? (8)

I believe the answer is:

manitoba

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

'province?' is the definition.
(province of Canada)

'canada's main boat-building' is the wordplay.
'main boat' can be anagrammed to 'MANITOBA'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for manitoba that I've seen before include "Winnipeg area" , "Strange boatman I find in Canada" , "Canadian province, capital Winnipeg" , "Canadian territory" , "northern territory" .)

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