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 Newsday and the USA Today.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.