Demon not proving fiendish in North American city (8)

I believe the answer is:

edmonton

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

'city' is the definition.
(Canadian city)

'demon not proving fiendish in north american' is the wordplay.
'demon not' can be anagrammed to 'EDMONTON'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for edmonton that I've seen before include "Provincial city" , "Part of London (or Alberta)" , "destination for Gilpin" , "Canadian city - region of London" , "Odd demon not in a Canadian city" .)

I've seen this clue in The Telegraph.

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