How many letters does the top answer for “composer of a child's garden of verses” have?

The most common answer is stevenson (9 letters).

Crossword clue: composer of a child's garden of verses

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

stevenson 9 letters wd-fact-v3

United States politician and diplomat (1900-1968)

author of a child's garden of verses 60% similar → stevenson

wrote a child's garden of verses 60% similar → stevenson

a composer of verses. 50% similar → metrician