Don't light up so much like some fuel (9)
I believe the answer is:
smokeless
'don't' is the definition.
The answer and definition are not the same part of speech.
'light up so much like some fuel' is the wordplay.
'light up' becomes 'smoke' (I've seen this in another clue).
'so much like some fuel' becomes 'less' (I can't justify this - if you can you should give a lot more credence to this answer).
'smoke'+'less'='SMOKELESS'
Can you help me to learn more?
(Other definitions for smokeless that I've seen before include "Like clean fuels" , "like coke?" , "Like cleaner fuels" , "type of fuel" .)