It's needed to produce energy (4)

I believe the answer is:

fuel

(Other definitions for fuel that I've seen before include "Material for burning" , "Material fed to flames" , "Combustible material" , "Combustibles" , "Burned source of energy" .)

I've seen this clue in The Irish Times.

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.