Spanish port on the Bay of Biscay, famous since medieval times for the production of iron and steel goods (6)

I believe the answer is:

bilbao

(Other definitions for bilbao that I've seen before include "Basque city" , "Basque capital" , "European city" , "Spanish Basque port" , "Spanish Biscay port" .)

I've seen this clue in The Independent.

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