As a hunter he's highly placed (5)
I believe the answer is:
orion
'as a hunter he's highly placed' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
This is all the clue.
Can you help me to learn more?
(Other definitions for orion that I've seen before include "Group of stars" , "Great hunter of Greek myth, and a constellation" , "Constellation named for great Greek hunter" , "Prominent constellation" , "Major constellation" .)