Prominent constellation (5)
I believe the answer is:
orion
'prominent constellation' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for orion that I've seen before include "Group in heaven" , "Greek hunter of myth or bright constellation" , "One who would hunt" , "Constellation that includes Betelgeuse" , "Constellation on the celestial equator -- giant hunter of Greek mythology" .)