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

The most common answer is london (6 letters).

Crossword clue: wrote martin eden

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

london 6 letters wd-fact-v3

the capital and largest city of England; located on the Thames in southeastern England; financial and industrial and cul

wrote eden 67% similar → lem

author of martin eden 50% similar → london

wrote east of eden 50% similar → steinbeck