Pianist Serkin (6)
I believe the answer is:
rudolf
'pianist serkin' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rudolf that I've seen before include "A popular red-nosed reindeer" , "- Nureyev, twenieth century ballet dancer" , "N Nureyev, dancer" , "One of Santa's reindeer" .)