City in the Ruhr Valley (5)
I believe the answer is:
essen
'city in the ruhr valley' 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 place name" , "city in the Ruhr valley" , "Industrial centre of the Ruhr" , "German industrial city on the Ruhr" , "German industrial centre" .)