Inert gaseous element; symbol Kr (7)

I believe the answer is:

krypton

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

I've seen this clue in The Mirror.

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.