German, perhaps, but this man's Turkish! (4)
I believe the answer is:
otto
This might be a double definition.
'german' is the first definition.
(common German name)
'but this man's turkish' is the second definition.
'Otto' can be an answer for 'man's' (I have seen 'A man' mean 'otto' so perhaps 'man' could also mean 'otto'). I am not sure about the rest of the definition.
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for otto that I've seen before include "- Preminger, Austrian-born US film producer" , "perfume ingredient" , "fragrance comes from?" , "Four-stroke cycle -- palindromic name" , "-- Klemperer, conductor" .)