How many letters does the top answer for “wrote the bird with the crystal plumage” have?

The most common answer is argento (7 letters).

Crossword clue: wrote the bird with the crystal plumage

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

argento 7 letters wd-fact-v3

author of the bird with the crystal plumage 60% similar → argento

composer of the bird with the crystal plumage 60% similar → argento

director of the bird with the crystal plumage 60% similar → argento

wrote the birds 50% similar → hitchcock