Crossword clue: a dry, indehiscent, usually one-seeded, winged fruit, as that of the ash, maple, and elm; a key or key fruit.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
a winged often one-seed indehiscent fruit as of the ash or elm or maple