Giant collection of stars (5)
I believe the answer is:
orion
This clue might be a double definition.
'giant' is the first definition.
(thesaurus)
'collection of stars' is the second definition.
'orion' can be an answer for 'stars' (Orion is a constellation). I am unsure of the 'collection of' bit.
Can you help me to learn more?
(Other definitions for orion that I've seen before include "Hunter slain by Artemis" , "Constellation with seven bright stars" , "Mythical Greek hunter turned into constellation" , "Constellation that includes Betelgeuse" , "A giant hunter in Greek legend, and a constellation" .)