How many letters does the top answer for “author of democracy and education” have?

The most common answer is dewey (5 letters).

Crossword clue: author of democracy and education

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

dewey 5 letters wd-fact-v3

United States pragmatic philosopher who advocated progressive education (1859-1952)

author of democracy in america 50% similar → tocqueville

author of sentimental education 50% similar → flaubert

wrote democracy and education 50% similar → dewey