Partly burned fuel that draws well (8)
I believe the answer is:
charcoal
'draws well' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'partly burned fuel' is the wordplay.
'partly burned' becomes 'char' (I can't explain this - if you can you should believe this answer much more).
'fuel' becomes 'coal' (coal is a kind of fuel).
'char'+'coal'='CHARCOAL'
'that' acts as a link.
Can you help me to learn more?
(Other definitions for charcoal that I've seen before include "Stick of black carbon material used for drawing" , "Dark grey colour" , "Art material and fuel" , "Black residue of burnt wood" , "Fuel used for drawing" .)