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All answers having "Essentials" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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ABCS

MEAT



5 Character Answers:

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MUSTS

NEEDS



7 Character Answers:

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STAPLES



9 Character Answers:

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BAREBONES

BAREFACTS



10 Character Answers:

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BASICNEEDS

BRASSTACKS



11 Character Answers:

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WHEREWITHAL



12 Character Answers:

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NUTSANDBOLTS



15 Character Answers:

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BARENECESSITIES