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All answers having "Fortified" as clue:

3 Character Answers:

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RHO



5 Character Answers:

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ARMED



6 Character Answers:

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BLEACH

MANNED

NUTMEG

WALLED



8 Character Answers:

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BEEFEDUP

ENRICHED



9 Character Answers:

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EMBATTLED

RAMPARTED



12 Character Answers:

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STRENGTHENED