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All answers having "Stiff" as clue:

3 Character Answers:

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LIT



4 Character Answers:

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HARD

OOZE

PRIM

RARE

RUFF

TAUT

WIRY



5 Character Answers:

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BORED

CHEAT

ERECT

REIGN

RIGID

SETAE

TENSE



6 Character Answers:

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CHACHA

CORPSE

FORMAL

FRIGID

POTENT

SCARED

WOODEN



7 Character Answers:

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CADAVER

INUTERO

PIEEYED

STARCHY

STILTED



8 Character Answers:

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RESIDENT

STARCHED

UNLIMBER



9 Character Answers:

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ENDURANCE

INELASTIC

STONEDEAD



11 Character Answers:

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IRISHCOFFEE