Exploding star (4)
'exploding star' 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 "Star that suddenly increases in brightness" , "Newly bright star" , "Star that becomes much brighter for short time" , "Star suddenly erupting in brightness" , "It shines" .)
(Other definitions for diva that I've seen before include "Great singer" , "Operatic soprano" , "High-maintenace woman" , "For example Sutherland" , "Prima donna, woman opera singer" .)
'exploding star' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for supernova that I've seen before include "it puts an end to a starry career" , "Exploding star that becomes much brighter" , "Star that explodes and becomes extremely luminous" , "The sort of star" , "Star made brilliant by stellar explosion" .)