Factory devours energy where we live (6)
I believe the answer is:
planet
'where we live' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'factory devours energy' is the wordplay.
'factory' becomes 'plant' (I've seen this in other clues).
'devours' means one lot of letters goes inside another (I've seen this in other clues).
'energy' becomes 'e' (physics symbol as in E=mc2).
'plant' going around 'e' is 'PLANET'.
Can you help me to learn more?
(Other definitions for planet that I've seen before include "body in orbit" , "Orbiting heavenly body" , "one of seven in suite" , "World" , "Large satellite of star" .)