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All answers having "Close friend" as clue:

3 Character Answers:

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ACE

PAL

RHO



4 Character Answers:

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BRAH

CHUM



5 Character Answers:

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BUDDY

CRONY



7 Character Answers:

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COMRADE

DEARONE



8 Character Answers:

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INTIMATE

SIDEKICK



9 Character Answers:

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CONFIDANT



10 Character Answers:

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BOSOMBUDDY