Actress Tatyana (3)
I believe the answer is:
ali
'actress tatyana' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ali that I've seen before include "Fourth caliph of Islam" , "Cassius Clay became Muhammad ..." , "Muhammad --, US boxer" , "Muhammad ___ (or MacGraw?)" , "Mohammed . . . (boxer)" .)