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All answers having "Tarnish" as clue:

3 Character Answers:

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MAR

RHO



4 Character Answers:

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RUST

SOIL

STAR



5 Character Answers:

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DISCO

SMEAR

STAIN

SULLY

TAINT



6 Character Answers:

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DAMAGE

DEFILE

IMPAIR

SMIRCH



7 Character Answers:

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BESMEAR

BIGGAME



8 Character Answers:

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BESMIRCH

DISCOLOR

DISGRACE



9 Character Answers:

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STAIDNESS