Crossword Genius

Dirty froth (4)

Ross

I believe the answer is:

scum

'dirty froth' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for scum that I've seen before include "Offscourings" , "Floating dirt or froth" , "Impurities on surface of liquid - or bad people" , "Impurities floating on surface, or despicable people" , "Floating film of filth" .)

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