Crossword Genius

Smutty material: this should be cleaned up! (5)

Ross

I believe the answer is:

filth

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'smutty material' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

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(Other definitions for filth that I've seen before include "Real dirt or obscenity", "Disgusting dirt or obscenity", "Dirt, obscene talk", "Repulsive dirt", "Squalor".)

I've seen this clue in The Sun.
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