Crossword Genius

Medium chance, without initial dirt (4)

Ross

I believe the answer is:

muck

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'dirt' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for muck that I've seen before include "Dirt (associated with brass)" , "Farmyard manure" , "Dirt, manure" , "Dirt, mud" , "Moist farmyard dung" .)

I've seen this clue in The Daily Express.
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