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All answers having "Secured" as clue:

3 Character Answers:

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GOT

WON



4 Character Answers:

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FAST

ICED

SHUT

SNUG

TIED



5 Character Answers:

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FIXED

ROPED

TAPED



6 Character Answers:

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BONDED

BTENED

GOTTEN

HASPED

INHAND

LANDED

LASHED

MOORED

PINNED

WEDGED



7 Character Answers:

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LINEDUP

PUTTIED

SPEARED



8 Character Answers:

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ANCHORED

ATTAINED

BATTENED

FASTENED

NAILEDIN

REELEDIN

TIEDDOWN



10 Character Answers:

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BUTTONEDUP

LADPAYMENT

NAILEDDOWN

STRAPPEDIN



15 Character Answers:

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UNDERLOCKANDKEY