Crossword Genius

Astronomical sighting (4)

Ross

I believe the answer is:

nova

'astronomical sighting' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for nova that I've seen before include "sun" , "Suddenly bright star" , "Star that ejects a cloud, thus becoming brighter" , "Suddenly expanding star" , "Star showing a sudden temporary increase in brightness" .)

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