How many letters does the top answer for “director of rock-a-doodle” have?

The most common answer is bluth (5 letters).

Crossword clue: director of rock-a-doodle

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

bluth 5 letters wd-fact-v3

director of fraggle rock 50% similar → henson

director of school of rock 50% similar → linklater