Definitions from Wiktionary (juice harp)
▸ noun:  Alternative spelling of Jew's harp [A musical instrument consisting of a flexible metal or bamboo “tongue” attached to a frame. This tongue is placed in the performer's mouth and plucked with the finger to produce a note of constant pitch. Melodies can be created by changing the shape of the mouth and causing different overtones.]

Opposite:

juiceless harp, silent harp, non-sounding harp

Clues:

jaws'-harp,  jaw's harp

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