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All answers having "Require" as clue:

3 Character Answers:

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ASK



4 Character Answers:

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ARIA

LACK

LAMB

NEED

TAKE

WANT



5 Character Answers:

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EXACT



6 Character Answers:

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ASPECT

COMPEL

DEMAND

ENTAIL

ENTITY

OBLIGE

SQUEAL

STOLID



7 Character Answers:

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CALLFOR

INVOLVE

LUMBAGO

MANDATE



8 Character Answers:

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INSISTON

TRILLION



10 Character Answers:

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BEINNEEDOF



11 Character Answers:

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HAIRRAISING

NECESSITATE