Crossword Genius

Horrid filth finally removed (4)

Ross

I believe the answer is:

grim

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

I don't understand how the remainder of the clue works.

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(Other definitions for grim that I've seen before include "Dark, depressing" , "Forbidding harsh and unpleasant" , "looking black" , "Tight-lipped and foreboding" , "Stern, cruel" .)

I've seen this clue in The Sun.
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