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All answers having "Discerning" as clue:

4 Character Answers:

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KEEN

NICE

WISE



5 Character Answers:

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ACUTE



6 Character Answers:

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ASTUTE

SUBTLE



7 Character Answers:

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PRUDENT

SAPIENT



8 Character Answers:

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EDGEWISE

SENTIENT



9 Character Answers:

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CLEAREYED

MAKINGOUT

SELECTIVE



13 Character Answers:

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PERSPICACIOUS