How many letters does the top answer for “composer of dardanus” have?

The most common answer is rameau (6 letters).

Crossword clue: composer of dardanus

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

rameau 6 letters wd-fact-v3

French composer of operas whose writings laid the foundation for the modern theory of harmony (1683-1764)

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