How many letters does the top answer for “small old world finch whose male has a red breast and forehead” have?

The most common answer is linnet (6 letters).

Crossword clue: small old world finch whose male has a red breast and forehead

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

linnet 6 letters wn-def

small Old World finch whose male has a red breast and forehead

lintwhite 9 letters wn-def

small Old World finch whose male has a red breast and forehead