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

The most common answer is heinlein (8 letters).

Crossword clue: wrote 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)

wrote the double 67% similar → dostoyevsky

author of double star 50% similar → heinlein

wrote a star is born 50% similar → streisand

wrote double indemnity 50% similar → cain, wilder

wrote star maker 50% similar → stapledon

wrote star trek 50% similar → roddenberry

wrote star wars 50% similar → hamill, lucas

wrote the double-bass 50% similar → suskind