Somber poem (5)
I believe the answer is:
elegy
'somber poem' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elegy that I've seen before include "Poetic lament for the dead" , "Milton's Lycidas?" , "Work of poet" , "A sorrowful poem - Gray wrote a famous one" , "that may be on the dead" .)