Powered by atomic energy (7)

I believe the answer is:

nuclear

(Other definitions for nuclear that I've seen before include "Sort of energy" , "Type of energy" , "Involving part of an atom" , "In sociology, of a family of parents and offspring only" , "type of power supply" .)

I've seen this clue in The Telegraph.

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.