How many letters does the top answer for “a humorous verse form of 5 anapestic lines with a rhyme scheme aabba” have?

The most common answer is limerick (8 letters).

Crossword clue: a humorous verse form of 5 anapestic lines with a rhyme scheme aabba

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

limerick 8 letters wn-def

a humorous verse form of 5 anapestic lines with a rhyme scheme aabba