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All answers having "Fasteners" as clue:

4 Character Answers:

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PINS



5 Character Answers:

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BOLTS

CLIPS

HASPS

NAILS

SNAPS



6 Character Answers:

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CLASPS

RIVETS

SCREWS



9 Character Answers:

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BUTTONERS



10 Character Answers:

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COTTERPINS



11 Character Answers:

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TAXANDNAILS