Favourite role, stopping early for fuel (6)
I believe the answer is:
petrol
'for fuel' is the definition.
(petrol is a kind of fuel)
'favourite role stopping early' is the wordplay.
I cannot really understand how this works, but
'favourite' could be 'pet' (synonyms) and 'pet' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for petrol that I've seen before include "Gasoline" , "Common car fuel" , "Mineral oil refined as fuel" , "Fuel for road vehicles" , "The juice" .)