Crossword Genius

Make smooth (4)

Ross

I believe the answer is:

sand

'make smooth' is the definition.
(sanding is a kind of making smooth)

This is all the clue.

(Other definitions for sand that I've seen before include "Yellow-brown colour" , "Fine grit" , "Very tiny grains of rock" , "woman writer Chopin loved" , "Result of rock erosion" .)

I've seen this clue in The New York Times.
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