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All answers having "Ancient" as clue:

3 Character Answers:

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OLD

RED



4 Character Answers:

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AGED

EDOM

HOAR

OLDE

TYRE



5 Character Answers:

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EARLY

HOARY

OLDEN



6 Character Answers:

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AGEOLD

DONNED

OFDAYS

OLDAST



7 Character Answers:

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ARCHAIC

OLDTIME



8 Character Answers:

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PRIMEVAL



9 Character Answers:

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GRANDEVAL

OLDASTIME



13 Character Answers:

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OLDASTHEHILLS



15 Character Answers:

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ASOLDASTHEHILLS

OLDASMETHUSELAH



18 Character Answers:

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PREHISTORICPERIODS