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All answers having "Well I never!" as clue:

4 Character Answers:

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GOSH



5 Character Answers:

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HUMPH



6 Character Answers:

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MYWORD

REALLY



7 Character Answers:

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STONEME



9 Character Answers:

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FANCYTHAT

WHATNERVE



11 Character Answers:

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BLESSMYSOUL



13 Character Answers:

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WHATDOYOUKNOW