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All answers having "Intelligent" as clue:

3 Character Answers:

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APT



4 Character Answers:

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KEEN

WISE



5 Character Answers:

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ARIAS

LEVEL

SMART

VIRGO



6 Character Answers:

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BILLET

BRAINY

BRIGHT

CLEVER



7 Character Answers:

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BREWERY

LOGICAL



8 Character Answers:

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RATIONAL

SENSIBLE



9 Character Answers:

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INTENSIVE