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All answers having "Spire" as clue:

3 Character Answers:

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EAR

SEE

SLY



4 Character Answers:

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CLOD



5 Character Answers:

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HAUNT

TOWER



6 Character Answers:

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ASTUTE

EIGHTY

FLECHE



7 Character Answers:

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SPONSOR

STEEPLE



8 Character Answers:

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PINNACLE