How many letters does the top answer for “author of the bonfire of the vanities” have?

The most common answer is wolfe (5 letters).

Crossword clue: author of the bonfire of the vanities

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

wolfe 5 letters wd-fact-v3

United States writer best known for his autobiographical novels (1900-1938)

author of the moon and the bonfires 50% similar → pavese

author of vanity fair 50% similar → thackeray

wrote the bonfire of the vanities 50% similar → wolfe