How many letters does the top answer for “author of sense and sensibility” have?

The most common answer is austen (6 letters).

Crossword clue: author of sense and sensibility

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

austen 6 letters wd-fact-v3

English novelist noted for her insightful portrayals of middle-class families (1775-1817)

thompson 8 letters wd-fact-v3

English physicist (born in America) who studied heat and friction; experiments convinced him that heat is caused by movi

author of common sense 50% similar → paine

author of the sense of an ending 50% similar → barnes

author of the sixth sense 50% similar → shyamalan

director of sense and sensibility 50% similar → thompson

wrote sense and sensibility 50% similar → austen, thompson