Pianist Dame Myra
I believe the answer is:
'pianist dame myra' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hess that I've seen before include "Famous pianist" , "leading Nazi" , "Pianist Myra, Nazi Rudolf ---" , "Rudolf ..., Nazi leader imprisoned at Spandau" , "Cite as evidence" .)