The most common and most likely answer to this crossword clue is the 8 letter word CHARCOAL
I've seen this crossword clue in The Guardian
C
H
A
R
C
O
A
L
More clues leading to the result CHARCOAL
- Daily column includes a drawing
- Fuel must be cleaner — firm beginning to abandon oil finally
- Cleaner fuel that draws well?
- Cleaner fuel? Yes and no
- She does regular slots in scholarly form of art
- Fuel broken-down Chelsea tractor disgruntled setter leaves
- One cleaning firm needs a litre in fuel
- Kind of grey church on curve over a lake
- Dark grey tea Carol brewed
- Partly burn solid fuel that draws well
Buddy explains!

The straight part
We know that "Cleaner fuel? Yes and no" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cleaner fuel? yes and no = charcoal.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CHARCOAL mean?
CHARCOAL noun- Impure carbon obtained by destructive distillation of wood or other organic matter, that is to say, heating it in the absence of oxygen.
- A stick of black carbon material used for drawing.
- A drawing made with charcoal.
- A very dark gray colour.
- To draw with charcoal.
- To cook over charcoal.
- Of a dark gray colour.
- Made of charcoal.