How many letters does the top answer for “young bird that has just fledged or become capable of flying” have?

The most common answer is fledgeling (10 letters).

Crossword clue: young bird that has just fledged or become capable of flying

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

fledgeling 10 letters wn-def

young bird that has just fledged or become capable of flying

a young bird just fledged. 50% similar → fledgeling