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All answers having "Opened" as clue:

3 Character Answers:

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LED



5 Character Answers:

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BEGAN

UNDID



6 Character Answers:

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TAPPED

UNDONE



7 Character Answers:

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SLIDOUT

STARTED

UNLACED



8 Character Answers:

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ACCESSED

UNBARRED

UNBOLTED

UNFURLED

UNROLLED

UNSEALED



9 Character Answers:

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PREMIERED



10 Character Answers:

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UNSSEALELD