Crossword Genius

Furnace slag (7)

Ross

I believe the answer is:

clinker

'furnace slag' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for clinker that I've seen before include "Fragments left after a fire" , "Stony residue from a furnace" , "Furnace slag" , "Stony residue from burnt coal" .)

I've seen this clue in The Guardian and The Telegraph.
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