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

The most common answer is kafka (5 letters).

Crossword clue: wrote the castle

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

kafka 5 letters wd-fact-v3

Czech novelist who wrote in German about a nightmarish world of isolated and troubled individuals (1883-1924)

wrote takeshi's castle 67% similar → kitano

wrote the blue castle 67% similar → montgomery

wrote the interior castle 67% similar → avila

wrote the white castle 67% similar → pamuk

wrote 1q84 50% similar → murakami

wrote 2666 50% similar → bolano

wrote 4 3 2 1 50% similar → auster

wrote q11368 50% similar → kernighan, ritchie