Crossword clue: a small, flat, wind instrument of music, in which the notes are produced by the vibration of free metallic reeds.

The most common answer is harmonicon (10 letters).

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

Possible answers

harmonicon 10 letters web-def

A small, flat, wind instrument of music, in which the notes are produced by the vibration of free metallic reeds.