Conductor Klemperer
I believe the answer is:
'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" .)