Blast furnace input (4,3)

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4,3

iron ore

'blast furnace input' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for iron ore that I've seen before include "From which a particular metal may be extracted" , "Nero or I (anag) -- from which a common metal comes" , "Raw source of metal" , "Aggregate from which the metal Fe can be extracted" , "source of heavy metal" .)

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