Crossword Genius

Coating that acts as an abrasive (5)

Ross

I believe the answer is:

emery

(Other definitions for emery that I've seen before include "Black abrasive" , "Rock used as abrasive" , "Abrasive powder" , "Dick - - , late comedian" , "hard stuff" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).
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