Audrey —, Best Actress in a Leading Role Oscar winner for Roman Holiday (7)
I believe the answer is:
hepburn
(Other definitions for hepburn that I've seen before include "Audrey -; Katharine -, film actresses" , "Actress Katharine or Audrey" , "See 9" , "Audrey and Katharine, film stars" , "Audrey --, film actress" .)