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All answers having "Expands" as clue:

3 Character Answers:

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UPS



5 Character Answers:

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GROWS

OPENS

PUFFS



6 Character Answers:

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ADDSTO

SPLAYS

SWELLS

WIDENS



7 Character Answers:

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DILATES

OPENSUP

SPREADS



8 Character Answers:

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ADDSONTO

BROADENS

DISTENDS



10 Character Answers:

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SPREADSOUT