How many letters does the top answer for “a song or hymn of mourning composed or performed as a memorial to a dead person” have?

The most common answer is coronach (8 letters).

Crossword clue: a song or hymn of mourning composed or performed as a memorial to a dead person

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

coronach 8 letters wn-def

a song or hymn of mourning composed or performed as a memorial to a dead person

dirge 5 letters wn-def

a song or hymn of mourning composed or performed as a memorial to a dead person

threnody 8 letters wn-def

a song or hymn of mourning composed or performed as a memorial to a dead person