Actress Katharine of "The Graduate" (4)

I believe the answer is:

ross

(Other definitions for ross that I've seen before include "Macbeth thane; a T. E. Lawrence pseudonym" , "- and Cromarty, former Scottish county" , "Diana --, Motown singer" , "Diana - (Supremes)" , "-- Dependency; -- Sea" .)

I've seen this clue in The New York Times.

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