Poem of lament (5)
I believe the answer is:
elegy
'poem of lament' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for elegy that I've seen before include "A sorrowful poem - Gray wrote a famous one" , "Mournful song or poem" , "Work by Gray?" , "Dirge" , "Poem of mourning" .)