Artist may use this daily fuel (8)
I believe the answer is:
charcoal
'artist may use this' is the definition.
The definition suggests a singular noun which matches the answer.
'daily fuel' is the wordplay.
'daily' becomes 'char' (both can mean a cleaner).
'fuel' becomes 'coal' (coal is a kind of fuel).
'char'+'coal'='CHARCOAL'
Can you help me to learn more?
(Other definitions for charcoal that I've seen before include "It's used in drawing and barbecues" , "Dark grey colour" , "Artist's black material" , "Black fuel made from wood, good for barbecues (8)" , "Black residue of burnt wood" .)