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All answers having "Firmly fixed" as clue:

4 Character Answers:

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FAST



5 Character Answers:

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RIGID

SETON

TIGHT



6 Character Answers:

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INTENT

STABLE



7 Character Answers:

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DEADSET

DEEPSET



8 Character Answers:

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ANCHORED



10 Character Answers:

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DEEPROOTED

DEEPSEATED