Constellation – mythological hunter (5)
I believe the answer is:
orion
I believe this clue is a double definition.
'constellation' is the first definition.
(I know that Orion is a constellation)
'mythological hunter' is the second definition.
(I've seen this in another clue)
(Other definitions for orion that I've seen before include "Hunter slain by Artemis" , "Star" , "Constellation named for great Greek hunter" , "Bright constellation, named after legendary Greek hunter" , "hero" .)