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All answers having "Openings" as clue:

3 Character Answers:

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ORA



4 Character Answers:

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GAPS



5 Character Answers:

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GATES

HOLES

PORES

SLITS

SLOTS

VENTS



6 Character Answers:

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CLEFTS

DEBUTS

INTROS

ONSETS

SPACES



7 Character Answers:

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LEADINS

OUTLETS



8 Character Answers:

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ORIFICES



9 Character Answers:

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APERTURES

PREMIERES