Pheasant (5)
I believe the answer is:
argus
'pheasant' is the definition.
(argus is a kind of pheasant)
This is all the clue.
(Other definitions for argus that I've seen before include "In Greek myth, a many-eyed monster slain by Hermes" , "Many-eyed mythical monster" , "Giant with one hundred eyes in Greek mythology" , "Monster with many eyes slain by Hermes in Greek myth" , "Small butterfly" .)