German boy unaffected by upset (4)

I believe the answer is:

otto

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'german' is the definition.
(common German name)

I can't explain the remainder of the clue.

(Other definitions for otto that I've seen before include "Rose petal oil; Bismarck's name" , "-- Klemperer, conductor" , "Palindromic German male Christian name" , "____ Preminger, US film director born in Austria" , "Palindromic fragrance" .)

I've seen this clue in The Guardian.

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