Unfinished piece could become a great poem (4)

I believe the answer is:

epic

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'a great poem' is the definition.
'epic' can be an answer for 'poem' (an epic poem). I am not sure about the 'a great' bit.

'unfinished piece could become' is the wordplay.
'unfinished' means to remove the last letter.
'could become' is an anagram indicator.
'piece' with its last letter taken off is 'piec'.
'piec' is an anagram of 'EPIC'.

Can you help me to learn more?

(Other definitions for epic that I've seen before include "(Of) immense (proportions)" , "Long account" , "Larger than life" , "Long poem telling of heroic events" , "Great movie" .)

I've seen this clue in The Irish News.

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