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'm not sure about the 'foreign' bit.

'duchesse nightly goes around' is the wordplay.
'around' says the answer is hidden in the clue.
'ESSEN' is hidden in the letters of '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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