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All answers having "Column" as clue:

3 Character Answers:

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PAR



4 Character Answers:

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ANTA

ONES

PIER

POLE

POST



5 Character Answers:

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AGONY

SHAFT

STELE



6 Character Answers:

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PILLAR

SPINAL



7 Character Answers:

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FACEOFF



8 Character Answers:

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PILASTER