Consume fuel without pressure (3)
I believe the answer is:
eat
'consume' is the definition.
(to consume something is to eat it)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for eat that I've seen before include "tolerate in diet" , "Bite, chew and swallow" , "put away" , "Corrode" , "Devour" .)