Crossword Genius

Rough powder (5)

Ross

I believe the answer is:

emery

(Other definitions for emery that I've seen before include "Hard, grey-black mineral used as 11 down" , "Hard grey-black mineral used as an abrasive" , "Coating on paper used as an abrasive" , "Abrasive form of corundum" , "Black abrasive" .)

I've seen this clue in The Wall Street Journal.
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