Scum (5)

I believe the answer is:

dross

'scum' is the definition.
(I know that dross is a type of scum)

This is the entire clue.

(Other definitions for dross that I've seen before include "Waste from molten metal" , "Rubbish, scum" , "Scum on molten metal" , "Scum on molten metals" , "Something of inferior quality" .)

I've seen this clue in The Mirror, The Telegraph, The Times, The Sunday Times, the Evening Standard and The Sun.

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