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Crossword answers in top half of the grid? Not exactly (8,6)

Ross

I believe the answer is:

northern lights

I'm a little stuck... Click here to teach me more about this clue!

But I can't explain it at all! Could you help me understand?

(Other definitions for northern lights that I've seen before include "Blackpool illuminations?" , "Celestial phenomenon" , "a must-see for Arctic cruisers?" , "What flickers in the sky" , "overhead display" .)

I've seen this clue in The Hindu.
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