How many letters does the top answer for “composer of the color purple” have?

The most common answer is busia (5 letters).

Crossword clue: composer of the color purple

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

busia 5 letters wd-fact-v3

goldberg 8 letters wd-fact-v3

United States cartoonist who drew intricate diagrams of very complicated and impractical contraptions that accomplished

of a purple color; purple. 67% similar → purpureal

a pale purple color 50% similar → lavender

author of the color purple 50% similar → busia, goldberg, walker

composer of purple hearts 50% similar → carson

of a moderate purple color 50% similar → amethyst

of a pale purple color 50% similar → lilac

wrote the color purple 50% similar → busia, goldberg, walker