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

The most common answer is hitchcock (9 letters).

Crossword clue: author of vertigo

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

hitchcock 9 letters wd-fact-v3

English film director noted for his skill in creating suspense (1899-1980)

stewart 7 letters wd-fact-v3

Scottish philosopher and follower of Thomas Reid (1753-1828)

author of 1q84 50% similar → murakami

author of 2666 50% similar → bolano

author of 4 3 2 1 50% similar → auster

author of q11368 50% similar → kernighan, ritchie

author of q13415681 50% similar → hamill

author of q134773 50% similar → zemeckis

author of q1457000 50% similar → knuth

author of q16276 50% similar → roddenberry