Epic poem written in Homeric Greek (5)
I believe the answer is:
iliad
'epic poem written in homeric greek' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for iliad that I've seen before include "Greek epic poem about the Trojan War" , "The -----, Homeric epic" , "Homer's ancient Greek epic" , "Long Homeric poem" , "Great poem by Homer" .)