How many letters does the top answer for “author of the bluest eye” have?

The most common answer is morrison (8 letters).

Crossword clue: author of the bluest eye

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

morrison 8 letters wd-fact-v3

United States writer whose novels describe the lives of African-Americans (born in 1931)

author of eye of the needle 50% similar → follett

author of story of the eye 50% similar → bataille

wrote the bluest eye 50% similar → morrison