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All answers having "Boisterous" as clue:

4 Character Answers:

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LOUD



5 Character Answers:

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AROAR

JOLLY

NOISY

ROWDY



6 Character Answers:

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STORMY



7 Character Answers:

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RAUCOUS

RIOTOUS



10 Character Answers:

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HURLYBURLY

KNOCKABOUT

RIPROARING

ROLLICKING

ROWDYDOWDY



11 Character Answers:

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RUMBUSTIOUS



13 Character Answers:

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INHIGHSPIRITS