Great falls of North America (7)

I believe the answer is:

niagara

(Other definitions for niagara that I've seen before include "Horseshoe, American and Bridal Veil Falls, collectively" , "It falls in North America" , "N. American waterfall" , "Famous Falls once walked by Blondin" , "Great waterfalls on border of USA and Canada" .)

I've seen this clue in the Sydney Morning Herald.

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