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All answers having "Rocks" as clue:

3 Character Answers:

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EIS

ICE



4 Character Answers:

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ORES

TORS



5 Character Answers:

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CRAGS

DAZES

SCARS

STUNS

SWAYS



6 Character Answers:

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STOICS

STONES



7 Character Answers:

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TEETERS

TOTTERS



8 Character Answers:

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BOULDERS

ICECUBES