Crossword Genius

Viscous gunk (6)

Ross

I believe the answer is:

sludge

(Other definitions for sludge that I've seen before include "Dirty oil; soft wet mud" , "Muddy sediment" , "Melting snow" , "Thick, soft, wet mud" , "'Muck, slime (6)'" .)

I've seen this clue in the USA Today.
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