Crossword Genius

Solid scum on molten metal (4)

Ross

I believe the answer is:

slag

(Other definitions for slag that I've seen before include "Coal mining waste" , "Waste left over from coal-mining" , "Scum on metal - dissolute woman" , "Waste left after metal is taken from ore" , "Cinders could become this" .)

I've seen this clue in The Guardian.
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