Almost stocked, saving energy with petrol, say (4)
I believe the answer is:
fuel
This clue could be a double definition.
'almost stocked saving energy' is the first definition.
'fuel' can be an answer for 'energy' (I've seen this before). I am not certain of the 'almost stocked saving' bit.
'petrol say' is the second definition.
(petrol is a kind of fuel)
'with' acts as a link.
Can you help me to learn more?
(Other definitions for fuel that I've seen before include "Eg, coal or petrol" , "Eg, coal or oil" , "Coal or gas?" , "Substance to produce energy" , "Substance burned to source power" .)