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

I believe the answer is:

manitoba

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'province?' is the definition.
(Manitoba is an example)

'canada's main boat-building' is the wordplay.
'canada's main' becomes 'mani' (I can't explain this - if you can you should believe this answer much more).
'building' indicates anagramming the letters.
'boat' with letters rearranged gives 'toba'.
'mani'+'toba'='MANITOBA'

Can you help me to learn more?

(Other definitions for manitoba that I've seen before include "State" , "Canadian province, capital Winnipeg" , "place in the prairies" , "northern territory" , "part of N America" .)

I've seen this clue in the Evening Standard.

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