Crossword Genius

Outside latrine ultimately leads to sludge (5)

Ross

I believe the answer is:

slime

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'to sludge' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for slime that I've seen before include "Sludge, gloop" , "Nasty slippery stuff" , "Gooey seeping stuff" , "could make things sticky" , "Slippery mud; slug trail" .)

I've seen this clue in The Independent.
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