PBS science show (4)

I believe the answer is:

nova

'pbs science show' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for nova that I've seen before include "Canadian province" , "Star briefly brightening" , "Suddenly bright star" , "Star showing a sudden, brief increase in luminosity" , "It shines" .)

I've seen this clue in the Penny Press, the King Feature Syndicate and the Universal.

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