Steffi —, Australian Open singles tennis championship winner from 1988-90 and 1994 (4)

I believe the answer is:

graf

(Other definitions for graf that I've seen before include "Steffi --, tennis player" , "Noted tennis player" , "German count - German tennis player" , "Seven-times women's Wimbledon champion, b. 1969" , "German tennis player, b. 1969" .)

I've seen this clue in The Mirror.

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