How many letters does the top answer for “director of batman returns” have?

The most common answer is keaton (6 letters).

Crossword clue: director of batman returns

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

keaton 6 letters wd-fact-v3

United States comedian and actor in silent films noted for his acrobatic skills and deadpan face (1895-1966)

director of batman 67% similar → keaton

director of the batman 67% similar → kravitz

director of superman returns 50% similar → singer