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All answers having "Instruction" as clue:

3 Character Answers:

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COP



4 Character Answers:

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ORAL

STEP



5 Character Answers:

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COBRA

ISSUE

ORDER

SITAR



6 Character Answers:

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LESSON



7 Character Answers:

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AUSTERE

RAVIOLI

TUITION



8 Character Answers:

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COACHING

TEACHING

TRAINING

TUTELAGE



11 Character Answers:

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NOWANDAGAIN



13 Character Answers:

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YOUPLAYALLTHE



15 Character Answers:

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RIGHTNOTESBUTIN