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All answers having "Astonishing" as clue:

4 Character Answers:

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GAIT



5 Character Answers:

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AWING

ERECT



7 Character Answers:

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AMAZING



8 Character Answers:

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DIAMANTE

OLIVEOIL



9 Character Answers:

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STARTLING



10 Character Answers:

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EYEPOPPING

INCREDIBLE

SURPRISING



12 Character Answers:

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MINDBOGGLING