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All answers having "Secure" as clue:

3 Character Answers:

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GET

ICE

TIE

WIN



4 Character Answers:

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BIND

BOLT

EARN

FAST

FRAP

GETS

LAND

LASH

LOCK

MOOR

NAIL

SAFE

SEAL

SNUG

STOW

TAKE



5 Character Answers:

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BELAY

CLAMP

GATED

QSTEN

RIVET

STRAP

TIGHT

ZIPUP



6 Character Answers:

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ANCHOR

ARREST

ATTACH

ATTAIN

CLINCH

ENCODE

ENSURE

FASTEN

OBTAIN

RESCUE

SNAPIN

STABLE



7 Character Answers:

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ENCODED

STRAPIN

TENURED

TIEDOWN

TIGHTEN



8 Character Answers:

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MAKEFAST

NAILDOWN



10 Character Answers:

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DROPANCHOR

LITTLEROCK



12 Character Answers:

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SAFEANDSOUND



15 Character Answers:

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UNDERLOCKANDKEY