Epic story written 151 years after Christ's birth (5)

I believe the answer is:

iliad

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'epic' is the definition.
(I know that Iliad is a epic)

I don't understand how the rest of the clue works.

(Other definitions for iliad that I've seen before include "heroic work" , "Poem by 4 across" , "long story" , "Homer's epic account of the Trojan war" , "Greek epic poem describing the siege of Troy" .)

I've seen this clue in The Globe and Mail.

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