Crossword Genius

Sketchers' medium (8)

Ross

I believe the answer is:

charcoal

(Other definitions for charcoal that I've seen before include "Kind of fuel made by burning wood" , "It's used in drawing and barbecues" , "Art material and fuel" , "Fuel eg for barbecue" , "Sort of grey" .)

I've seen this clue in the Sydney Morning Herald.
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