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All answers having "Demanding" as clue:

4 Character Answers:

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HARD



5 Character Answers:

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BOSSY

DIVAS

NEEDY

RIGID

STERN



6 Character Answers:

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EDITOR

SEVERE

TAXING



7 Character Answers:

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ARDUOUS

EXIGENT

LIMITED

ONEROUS



8 Character Answers:

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EXACTING

INNEEDOF



9 Character Answers:

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INSISTENT



10 Character Answers:

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FASTIDIOUS



11 Character Answers:

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CHALLENGING



15 Character Answers:

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HIGHMAINTENANCE