Canadian city crawling with heroes (10)

I believe the answer is:

whitehorse

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'canadian city' is the definition.
'Whitehorse' can be an answer for 'city' (Whitehorse is an example). I am not certain of the 'canadian' bit.

'crawling with heroes' is the wordplay.
'crawling' indicates an anagram (letters crawl around).
'with'+'heroes'='withheroes'
'withheroes' is an anagram of 'WHITEHORSE'.

Can you help me to learn more?

I've seen this clue in The Hindu.

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