Major industrial region of north-west Germany (4)

I believe the answer is:

ruhr

'major industrial region of north-west germany' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ruhr that I've seen before include "German industrial zone, river" , "German industrial region" , "Ger. industrial region" , "industrial valley" , "Traditional region of German heavy industry" .)

I've seen this clue in The Guardian.

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