Carbon stick for drawing (8)
I believe the answer is:
charcoal
'carbon stick for drawing' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for charcoal that I've seen before include "Black residue of burnt wood" , "type of fuel" , "Very dark gray color" , "Form of carbon for drawing" , "Fuel eg for barbecue" .)