How many letters does the top answer for “the author of a mournful poem lamenting the dead” have?

The most common answer is elegist (7 letters).

Crossword clue: the author of a mournful poem lamenting the dead

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

elegist 7 letters wn-def

the author of a mournful poem lamenting the dead

a mournful poem; a lament for the dead 50% similar → elegy