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All answers having "Counterfeit" as clue:

3 Character Answers:

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BAD

FOE

TIN



4 Character Answers:

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FAKE

FAUX

MOCK

SHAM



5 Character Answers:

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BEAST

BOGUS

FALSE

FORGE

PHONY

TRACE



6 Character Answers:

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ERSATZ

FORGED

GEYSER

PSEUDO

VULGAR

YANKEE



7 Character Answers:

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ACCLAIM

FORGERY

IMITATE



8 Character Answers:

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SIMULATE

SPURIOUS



9 Character Answers:

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IMITATION

IMITATIVE



10 Character Answers:

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FUNNYMONEY