How many letters does the top answer for “author of symphony no. 3” have?

The most common answer is bernstein (9 letters).

Crossword clue: author of symphony no. 3

2 answers 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)

mendelssohn 11 letters wd-fact-v3

German musician and romantic composer of orchestral and choral works (1809-1847)

author of symphony no. 1 100% similar → schumann, shostakovich

author of symphony no. 4 100% similar → williams

author of symphony no. 6 100% similar → tchaikovsky

author of dante symphony 50% similar → liszt

composer of symphony no. 1 50% similar → brahms, bruckner, elgar

composer of symphony no. 100 50% similar → haydn

composer of symphony no. 3 50% similar → bernstein, gorecki, mendelssohn

composer of symphony no. 40 50% similar → mozart