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All answers having "Offspring" as clue:

3 Character Answers:

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FRY

GET

KID

SON

TEA



4 Character Answers:

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BYES

CION

DESC

DYED

HEIR

KIDS

SEED

SONS

STAG



5 Character Answers:

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BROOD

CHILD

EAVES

ISSUE

LITRE

RADIO

SCION

SEEDS

SPAWN

TUTTI

YOUNG



6 Character Answers:

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ATLAST

CHILLI



7 Character Answers:

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GLOBULE

PROGENY

SCARRED



8 Character Answers:

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CHILDREN



9 Character Answers:

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PROGENIES



10 Character Answers:

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DESCENDANT