Crossword Genius

Muck turning putrid, mostly (4)

Ross

I believe the answer is:

dirt

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'muck' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for dirt that I've seen before include "Obscenity" , "'Mud, dust or grime (4)'" , "Muck" , "Scandalous information" , "Grime - scandal" .)

I've seen this clue in the Evening Standard.
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