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All answers having "Progeny" as clue:

3 Character Answers:

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SON



4 Character Answers:

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SEED

SONS



5 Character Answers:

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BROOD

FRUIT

ISSUE

SCION

SPAWN

YOUNG



6 Character Answers:

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SCIONS



9 Character Answers:

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OFFSPRING



10 Character Answers:

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DESCENDANT