Crossword Genius

Pond blanket (4)

Ross

I believe the answer is:

scum

(Other definitions for scum that I've seen before include "to be seen on top" , "Impurities on water surface" , "Impurities floating on water, or despicable people" , "Impurities layer" , "Floating impurities or bad people" .)

I've seen this clue in the LA Times.
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