Foreign city duchesse nightly goes around (5)

I believe the answer is:

essen

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

'foreign city' is the definition.
'Essen' can be an answer for 'city' (Essen is an example). I am unsure of the 'foreign' bit.

'duchesse nightly goes around' is the wordplay.
'around' indicates the answer is hidden within the clue.
'ESSEN' is hidden within 'duchesse nightly goes'.

Can you help me to learn more?

(Other definitions for essen that I've seen before include "German industrial centre" , "European city" , "Industrial city of northwest Germany" , "Krupp HQ (Ger.)" , "German place name" .)

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