Relatively unknown economist ran German banks (8)

I believe the answer is:

stranger

I'm a little stuck... Click here to teach me more about this clue!

'relatively unknown' is the definition.
'stranger' can be an answer for 'unknown' (I've seen this before). I am not certain of the 'relatively' bit.

'economist ran german banks' is the wordplay.
'STRANGER' is hidden within the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for stranger that I've seen before include "Outsider" , "Unfamiliar person" , "More odd or wierd" , "Alien; odder" , "Regrants oddly to person unknown" .)

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