How many letters does the top answer for “author of the flying dutchman” have?

The most common answer is wagner (6 letters).

Crossword clue: author of the flying dutchman

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

wagner 6 letters wd-fact-v3

the music of Wagner

author of the flying classroom 50% similar → kastner

composer of the flying dutchman 50% similar → wagner

wrote the flying dutchman 50% similar → wagner