Crossword Genius

Slovenly woman is scum (4)

Ross

I believe the answer is:

slag

This clue is a double definition.

'slovenly woman' is the first definition.

'scum' is the second definition.
(slag is a kind of scum)

'is' is the link.

(Other definitions for slag that I've seen before include "Perfect" , "Mound of waste matter from mine" , "dissolute man (more recently)" , "Scum on metal - dissolute woman" , "Coal mining waste" .)

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