Brilliant display of light (6)

I believe the answer is:

aurora

(Other definitions for aurora that I've seen before include "Phenomenon in sky" , "Atmospheric luminance" , "Roman Godess of the Dawn" , "Dawn goddess; polar lights" , "Roman goddess of the dawn" .)

I've seen this clue in The Washington Post.

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.