How many letters does the top answer for “a small instrument with four strings, played with a bow; a fiddle.” have?

The most common answer is violin (6 letters).

Crossword clue: a small instrument with four strings, played with a bow; a fiddle.

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

violin 6 letters web-def

bowed stringed instrument that is the highest member of the violin family; this instrument has four strings and a hollow