Crossword Genius

Drawing medium (8)

Ross

I believe the answer is:

charcoal

(Other definitions for charcoal that I've seen before include "type of fuel" , "It's made by burners for use in burners" , "Stick of black carbon material used for drawing" , "Fuel - very dark grey" , "Fuel eg for barbecue" .)

I've seen this clue in The Times.
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