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All answers having "Basic" as clue:

3 Character Answers:

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NET

REQ



4 Character Answers:

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ELEM



5 Character Answers:

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NEEDS

PLAIN

VITAL



6 Character Answers:

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PRIMAL

STAPLE



7 Character Answers:

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ALSORAN

CENTRAL

DESERVE

RADICAL



8 Character Answers:

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INHERENT

INSTINCT

INTEGRAL

NOFRILLS

RUDIMENT



9 Character Answers:

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ELEMENTAL

ESSENTIAL



10 Character Answers:

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ELEMENTARY



11 Character Answers:

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BOGSTANDARD

FUNDAMENTAL

RUDIMENTARY



13 Character Answers:

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PUREANDSIMPLE



14 Character Answers:

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BREADANDBUTTER



15 Character Answers:

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MEATANDPOTATOES