Riverbank sediment (4)

I believe the answer is:

silt

(Other definitions for silt that I've seen before include "Sedimentary material" , "Slimy mud" , "Mud deposited in a river or lake" , "Sediment in a stream" , "Sedimentary deposit" .)

I've seen this clue in the Newsday.com, the USA Today and the Newsday.

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