Katharine —, Best Actress in a Leading Role Oscar winner for Morning Glory (7)

I believe the answer is:

hepburn

(Other definitions for hepburn that I've seen before include "Audrey and Katherine, film stars" , "Audrey -; Katharine -, film actresses" , "Audrey and Katharine, film stars" , "Actress Katharine or Audrey" , "See 9" .)

I've seen this clue in The Mirror.

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