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All answers having "Tact" as clue:

5 Character Answers:

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ASSET

POISE



7 Character Answers:

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FINESSE



8 Character Answers:

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PETULANT



9 Character Answers:

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DIPLOMACY

GOODTASTE



10 Character Answers:

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DISCRETION



11 Character Answers:

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SAVOIRFAIRE



15 Character Answers:

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DIPLOMATICSENSE