1979 film drama starring Ray Winstone and Mick Ford (4)

I believe the answer is:

scum

(Other definitions for scum that I've seen before include "Dirt on liquid surface" , "Floating dirt on surface" , "Offscourings" , "worst kind of people" , "Impurities on surface of liquid, or rotten people" .)

I've seen this clue in The Mirror.

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