Extract energy out to provide thrust (5)
I believe the answer is:
drive
This might be a double definition.
'extract energy out' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'thrust' is the second definition.
(I know that thrust can be written as drive)
'to provide' acts as a link.
Can you help me to learn more?
(Other definitions for drive that I've seen before include "Motivate" , "Urge; approach to house" , "Steer; trip" , "Determination, ambition" , "Hit ball with force" .)