Crossword Genius

Man behind losing jacket (4)

Ross

I believe the answer is:

otto

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'man' is the definition.
(I have seen 'A man' mean 'otto' so perhaps 'man' could also mean 'otto')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for otto that I've seen before include "Palindromic German name like Bismark's" , "Name of four German kings" , "Something essential" , "Swiss perhaps" , "fragrance comes from?" .)

I've seen this clue in The Telegraph.
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