Crossword clue: a small, portable, keyed wind instrument, whose tones are generated by play of the wind upon free metallic reeds.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
a portable box-shaped free-reed instrument; the reeds are made to vibrate by air from the bellows controlled by the play