How many letters does the top answer for “author of the red shoes” have?

The most common answer is powell (6 letters).

Crossword clue: author of the red shoes

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

powell 6 letters wd-fact-v3

English physicist who discovered the pion (the first known meson) which is a subatomic particle involved in holding the

author of deep red 50% similar → argento

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author of red sorghum 50% similar → yan

wrote the red shoes 50% similar → powell