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All answers having "Enthusiast" as clue:

3 Character Answers:

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BUG

BUM

FAN

NUT



4 Character Answers:

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BUFF

JOCK



5 Character Answers:

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DEMON

FIEND

FREAK

LOVER

RAVER



6 Character Answers:

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ADDICT

MANIAC

ZEALOT



7 Character Answers:

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AMATEUR

BOOSTER

DEVOTEE

FANATIC



10 Character Answers:

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AFICIONADO



11 Character Answers:

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EAGERBEAVER