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

The most common answer is heinlein (8 letters).

Crossword clue: author of double star

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

heinlein 8 letters wd-fact-v3

United States writer of science fiction (1907-1988)

author of the double 67% similar → dostoyevsky

author of a star is born 50% similar → streisand

author of double indemnity 50% similar → cain, wilder

author of star maker 50% similar → stapledon

author of star trek 50% similar → roddenberry

author of star wars 50% similar → hamill, lucas

author of the double-bass 50% similar → suskind

author of the double helix 50% similar → watson