Cool megastar? (3,5)
I believe the answer is:
red giant
This might be a double definition.
'cool' is the first definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?
'megastar?' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for red giant that I've seen before include "big star" , "Large star nearing the end of its life" , "Large low-temperature star" , "Megastar" , "Cool, immense star of high luminosity" .)