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All answers having "Youngsters" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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BOYS

KIDS

LADS

TADS

TOTS



5 Character Answers:

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TEENS

TYKES



6 Character Answers:

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KIDDOS

MINORS



7 Character Answers:

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MOPPETS



8 Character Answers:

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CHILDREN

SMALLFRY

TODDLERS