Mass for the departed (7)
I believe the answer is:
requiem
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mass for the departed</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 requiem that I've seen before include "Hymn of mourning" , "Mass for the souls of the dead" , "Funeral service" , "RC mass for the dead" , "Mass for the departed" .)