How many letters does the top answer for “wrote the canterville ghost” have?

The most common answer is wilde (5 letters).

Crossword clue: wrote the canterville ghost

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

wilde 5 letters wd-fact-v3

Irish writer and wit (1854-1900)

wrote ghost 67% similar → goldberg, moore

author of the canterville ghost 50% similar → wilde

wrote ghost whisperer 50% similar → hewitt