How many letters does the top answer for “wrote swan lake” have?

The most common answer is petipa (6 letters).

Crossword clue: wrote swan lake

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

petipa 6 letters wd-fact-v3

tchaikovsky 11 letters wd-fact-v3

important Russian composer whose works are noted for their expressive melodies (1840-1893)

author of swan lake 50% similar → petipa, tchaikovsky

composer of swan lake 50% similar → tchaikovsky

wrote the black swan 50% similar → taleb

wrote the lady in the lake 50% similar → chandler

wrote the lady of the lake 50% similar → scott

wrote the trumpet of the swan 50% similar → white