How many letters does the top answer for “composer of the possibility of an island” have?

The most common answer is houellebecq (11 letters).

Crossword clue: composer of the possibility of an island

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

houellebecq 11 letters wd-fact-v3

author of the possibility of an island 50% similar → houellebecq

composer of fantasy island 50% similar → hale

composer of treasure island 50% similar → stevenson

wrote the possibility of an island 50% similar → houellebecq