Crossword Genius

Lake bed sediment (4)

Ross

I believe the answer is:

silt

(Other definitions for silt that I've seen before include "Sediment deposited by water as in channel" , "Slimy mud" , "Fine sediment (often deposited by water)" , "Muddy deposit" , "Material deposited by a river" .)

I've seen this clue in the Universal and the Newsday.
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