How many letters does the top answer for “wrote explosion in a cathedral” have?

The most common answer is carpanter (9 letters).

Crossword clue: wrote explosion in a cathedral

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

carpanter 9 letters wd-fact-v3

author of explosion in a cathedral 50% similar → carpanter

wrote conversation in the cathedral 50% similar → llosa

wrote the cathedral and the bazaar 50% similar → raymond