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All answers having "Environment" as clue:

4 Character Answers:

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AREA



5 Character Answers:

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CLIME

MIDST



6 Character Answers:

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MEDIUM

MILIEU

SPHERE



7 Character Answers:

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CONTEXT

HABITAT

IMPLORE

SETTING



9 Character Answers:

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ENTOURAGE



11 Character Answers:

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OUTSTANDING



12 Character Answers:

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SURROUNDINGS