Crossword Genius

Surface froth (4)

Ross

I believe the answer is:

scum

(Other definitions for scum that I've seen before include "Floating rubbish" , "Algae" , "Floating impurity layer" , "Impurities on top of water or worthless people" , "Impurities on surface of liquid, or rotten people" .)

I've seen this clue in the Sydney Morning Herald.
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