Mount -, landmark where the climax of the film North by Northwest takes place (8)

I believe the answer is:

rushmore

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'mount' is the definition.
(Mount Rushmore in the USA)

I can't explain the rest of the clue.

(Other definitions for rushmore that I've seen before include "Mount . . . . . . . . in USA has giant carvings of presidents" , "Mount . . . . . . . . in USA has carved heads of presidents" , "Mount with presidential statuary" , "US mount with carved presidents' heads" , "Rock figureheads here" .)

I've seen this clue in The Times.

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