How many letters does the top answer for “author of the name of the rose” have?

The most common answer is eco (3 letters).

Crossword clue: author of the name of the rose

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

eco 3 letters wd-fact-v3

author of a rose for emily 50% similar → faulkner

author of the rose tattoo 50% similar → williams

director of the name of the rose 50% similar → annaud

wrote the name of the rose 50% similar → eco