City north of Cologne (5)
I believe the answer is:
essen
'city north of cologne' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for essen that I've seen before include "German industrial city on the Ruhr" , "Industrial city of northwest Germany" , "European city" , "Industrial centre of the Ruhr" , "Krupp HQ (Ger.)" .)