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All answers having "Keyboard instrument" as clue:

4 Character Answers:

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MOOG

PETS

STIR



5 Character Answers:

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ALOFT

CREWS

DEBUT

ORGAN

PIANO

TABOO



6 Character Answers:

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COVERT

RAGOUT

SPINET



7 Character Answers:

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CELESTA

CELESTE

CHUTNEY

CLAVIER

LAMBADA

NATURAL



8 Character Answers:

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ALMIGHTY

MELODEON

PREMIERE

SPRITZER



9 Character Answers:

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HARMONIUM

REEDORGAN



10 Character Answers:

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GRANDPIANO



11 Character Answers:

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HARPSICHORD



12 Character Answers:

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ASCORBICACID



13 Character Answers:

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ELECTRICORGAN

ELECTRICPIANO