German city in the Ruhr (5)
I believe the answer is:
essen
'german city in the ruhr' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for essen that I've seen before include "city in the Ruhr valley" , "German place name" , "Industrial city of northwest Germany" , "German industrial centre" , "German industrial city on the Ruhr" .)