How many letters does the top answer for “composer of west side story” have?

The most common answer is bernstein (9 letters).

Crossword clue: composer of west side story

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

bernstein 9 letters wd-fact-v3

United States conductor and composer (1918-1990)

author of west side story 60% similar → bernstein

wrote west side story 60% similar → bernstein

composer of into the west 50% similar → lennox