Waste coal (5)
I believe the answer is:
dross
(Other definitions for dross that I've seen before include "Waste coal - rubbish" , "Impurity" , "Worthless stuff" , "Slag!" , "Scum on molten metals" .)
I believe the answer is:
dross
(Other definitions for dross that I've seen before include "Waste coal - rubbish" , "Impurity" , "Worthless stuff" , "Slag!" , "Scum on molten metals" .)