German chap in black mass finds seat (4)
I believe the answer is:
otto
This clue might be a double definition.
'german' is the first definition.
(common German name)
'chap in black mass finds seat' is the second definition.
'Otto' can be an answer for 'chap'. I'm unsure of the 'in black mass finds seat' bit.
Can you help me to learn more?
(Other definitions for otto that I've seen before include "German king" , "Possibly a German" , "Preminger or von Bismark?" , "- - Preminger (films)" , "Ger. name (palindrome)" .)