Metal waste (4)
'metal waste' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dross that I've seen before include "Something of inferior quality" , "Worthless stuff" , "Worthless matter" , "Lees" , "It's Poor" .)
'metal 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 "Waste from ore refining" , "Cinder" , "Coal mining waste" , "Waste left over from coal-mining" , "dissolute man (more recently)" .)