How many letters does the top answer for “author of thirteen lives” have?

The most common answer is mortensen (9 letters).

Crossword clue: author of thirteen lives

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

mortensen 9 letters wd-fact-v3

author of they live 50% similar → carpenter

composer of thirteen lives 50% similar → mortensen

director of thirteen lives 50% similar → mortensen

wrote thirteen lives 50% similar → mortensen