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All answers having "Well-informed" as clue:

3 Character Answers:

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OVA



4 Character Answers:

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UPON



5 Character Answers:

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AWARE

DUETO

PLONK



6 Character Answers:

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VERSED



7 Character Answers:

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BUFFALO

ERUDITE

LEARNED

RUNINTO



8 Character Answers:

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UPTODATE



9 Character Answers:

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INTHEKNOW

INTHELOOP



13 Character Answers:

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KNOWLEDGEABLE