Giant constellation (5)
I believe the answer is:
orion
I believe this is a double definition.
'giant' is the first definition.
(thesaurus)
'constellation' is the second definition.
(Orion is an example)
(Other definitions for orion that I've seen before include "Large constellation" , "Constellation that includes Betelgeuse" , "He hunted" , "Hunter slain by Artemis" , "Major constellation" .)