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All answers having "Authentic" as clue:

4 Character Answers:

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ECHT

MEAL

REAL

TRUE



5 Character Answers:

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LEGIT

TRILL

VALID



6 Character Answers:

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ACTUAL

DINKUM

KOSHER



7 Character Answers:

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GENUINE

SINCERE



8 Character Answers:

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BONAFIDE



10 Character Answers:

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TRUETOLIFE