___ borealis (6)

I believe the answer is:

aurora

(Other definitions for aurora that I've seen before include "Northern/southern lights" , "Atmospheric phenomenon consisting of bands of light" , "Display of lights in the night sky" , "Dawn (literary)" , "Roman Godess of the Dawn" .)

I've seen this clue in the New York Times, The Guardian, the USA Today and the Universal.

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