Crossword Genius

Blacksmith's waste

Ross

I believe the answer is:

slag

(Other definitions for slag that I've seen before include "Waste left over from coal-mining" , "Waste from ore refining" , "a girl who puts out" , "Smelted-ore refuse" , "Scum on metal - dissolute woman" .)

I've seen this clue in The New York Times.
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