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All answers having "See-saw" as clue:

3 Character Answers:

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DAW



4 Character Answers:

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ROCK



5 Character Answers:

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WAVER



6 Character Answers:

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TEETER



11 Character Answers:

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TEETERBOARD



12 Character Answers:

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TEETERTOTTER



13 Character Answers:

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CHOPANDCHANGE