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All answers having "Instrument" as clue:

3 Character Answers:

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AXE

SAX



4 Character Answers:

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HARP

LUTE

LYRE

OBOE

REED

TOOL

TUBA



5 Character Answers:

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AGENT

BANJO

CELLO

ORGAN

PIANO

SITAR

VIOLA



6 Character Answers:

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ENGINE

GUITAR



7 Character Answers:

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PICCOLO

SERVANT



8 Character Answers:

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DULCIMER

MANDOLIN

TRIANGLE

TROMBONE



9 Character Answers:

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XYLOPHONE



10 Character Answers:

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DOUBLEBASS

FRENCHHORN

SOUSAPHONE