Rudolf --, ballet dancer (7)
I believe the answer is:
nureyev
(Other definitions for nureyev that I've seen before include "Rudolf -, Russ. dancer" , "Acclaimed Russian ballet dancer" , "Russian-born ballet dancer, who partnered Fonteyn, d. 1993" , "Fonteyn's dancing partner Rudolf" , "Rudolf -------, (1938-93), dancer" .)