Conductor Klemperer (4)
I believe the answer is:
otto
'conductor klemperer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for otto that I've seen before include "Palindromic German name like Bismark's" , "A man" , "Cooker" , "Preminger or von Bismark?" , "Palindromic fragrance" .)