How many letters does the top answer for “small old world songbird with a reddish breast” have?

The most common answer is redbreast (9 letters).

Crossword clue: small old world songbird with a reddish breast

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

redbreast 9 letters wn-def

small Old World songbird with a reddish breast