It fuels some of the older vehicles (4)

I believe the answer is:

derv

I'm a little stuck... Click here to teach me more about this clue!

'it fuels' is the definition.
The definition suggests a singular noun which matches the answer.

'of the older vehicles' is the wordplay.
'of' says the answer is hidden in the clue.
'DERV' can be found hidden inside 'older vehicles'.

'some' is the link.

Can you help me to learn more?

(Other definitions for derv that I've seen before include "Type of fuel" , "Diesel engine fuel oil" , "Fuel for lorries" , "Lorry fuel" , "Vehicle fuel oil" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.