How many letters does the top answer for “director of fraggle rock” have?

The most common answer is henson (6 letters).

Crossword clue: director of fraggle rock

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

henson 6 letters wd-fact-v3

United States puppeteer who created a troupe of puppet characters (1936-1990)

composer of fraggle rock 50% similar → henson

director of rock-a-doodle 50% similar → bluth

director of school of rock 50% similar → linklater