Raw fuel that could make you cheeky, breaking wind (5,3)
I believe the answer is:
crude oil
'raw fuel that could make you cheeky breaking wind' is the definition.
'crude oil' can be an answer for 'raw fuel' (type of fuel). I am not certain of the rest of the definition.
'raw fuel' is the wordplay.
'raw' becomes 'crude' (synonyms).
'fuel' becomes 'oil' (oil is a type of fuel).
'crude'+'oil'='CRUDE OIL'
Can you help me to learn more?
(Other definitions for crude oil that I've seen before include "From which petrol is made" , "Unrefined petroleum" , "output from rig" , "Source of fuel" , "liquid asset" .)