___ Wintour, editor-in-chief of Vogue since 1988 (4)
I believe the answer is:
anna
(Other definitions for anna that I've seen before include "Former one sixteenth of Rupee" , "___ Pavlova, Russian dancer, d. 1931" , "She's a woman, whichever way you look at it" , "Miss Karenina" , "Book by Tolstoy" .)