1953 film starring Marilyn Monroe and Joseph Cotten (7)

I believe the answer is:

niagara

(Other definitions for niagara that I've seen before include "Waterfall at Iran aga" , "US/Canadian falls" , "A lot of falling water" , "& 22 Down North American cascade" , "Horseshoe, American and Bridal Veil Falls, collectively" .)

I've seen this clue in The Independent.

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