Crossword Genius

Furnace waste (4)

Ross

I believe the answer is:

slag

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

This is all the clue.

(Other definitions for slag that I've seen before include "Scum on metal - dissolute woman" , "Waste from ore refining" , "a girl who puts out" , "Smelted-ore refuse" , "Mound of waste matter from mine" .)

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