Harms Superman's power (6)

I believe the answer is:

krypton

(Other definitions for krypton that I've seen before include "Gaseous element" , "Noble gas - Superman's birthplace" , "Gas used in lasers etc" , "36 periodically?" , "Pry knot (anag) - gas" .)

I've seen this clue in the Sydney Morning Herald.

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.