1953 thriller starring Marilyn Monroe and Joseph Cotten (7)

I believe the answer is:

niagara

(Other definitions for niagara that I've seen before include "Great waterfalls on US-Canada border" , "Great waterfalls on Canadian-US border" , "1953 Marilyn Monroe film noir thriller" , "Waterfall at Iran aga" , "It falls in North America" .)

I've seen this clue in The Mirror.

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