Song of mourning (5)
I believe the answer is:
elegy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">song of mourning</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for elegy that I've seen before include "Poem as Gray's in churchyard" , "Plaintive poem" , "Dirge" , "Poem for the departed" , "Poem lamenting the dead" .)