Crossword Genius

--- board, nailfile (5)

Ross

I believe the answer is:

emery

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

I've seen this clue in The Times.
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