"Rebel ___" ("Star Wars" fan film) (4)

I believe the answer is:

scum

(Other definitions for scum that I've seen before include "Impure film" , "Floating impurity layer" , "People regarded as worthless, especially criminals" , "Impurities on top of water or worthless people" , "to be seen on top" .)

I've seen this clue in the USA Today.

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