How many letters does the top answer for “wrote the red badge of courage” have?

The most common answer is crane (5 letters).

Crossword clue: wrote the red badge of courage

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

crane 5 letters wd-fact-v3

stretch (the neck) so as to see better

author of the red badge of courage 60% similar → crane