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All answers having "Fastens" as clue:

4 Character Answers:

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PEGS

PINS

SEWS

TIES



5 Character Answers:

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BINDS

BOLTS

GLUES

NAILS

SHUTS

SNAPS

TIETH



6 Character Answers:

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BELAYS

CLASPS

DOESUP

RIVETS



7 Character Answers:

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AFFIXES

LATCHES

SECURES



8 Character Answers:

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ATTACHES