Victim of Hermes (5)
I believe the answer is:
argus
'victim of hermes' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for argus that I've seen before include "Greek giant with 100 eyes" , "Various brown butterflies" , "Legendary Guardian" , "Pheasant, butterfly, a hundred-eyed monster" , "Many-eyed mythical monster" .)