Big star (3,4)
'big star' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for red giant that I've seen before include "Type of star" , "Cool, immense star of high luminosity" , "Huge Communist" , "big star" , "Large, cool bright star" .)
(Other definitions for celeb that I've seen before include "Famous person (colloq.)" , "popular star" , ""Personality"" , "Prominent figure" , "Household name" .)
'big star' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for idol that I've seen before include "Object of excessive love or devotion" , "Object of reverence" , "Hero of screen or stage" , "Film star" , "Sacred image" .)
'big 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 showing a sudden, brief increase in luminosity" , "Star showing a sudden temporary increase in brightness" , "Sudden light increase" , "A new flaring star" , "Exploding star" .)
(Another definition for pop idol that I've seen is " Talent show".)