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All answers having "Fantastic" as clue:

3 Character Answers:

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FAB

MAD

WOW



4 Character Answers:

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COOL

PHAT



5 Character Answers:

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ANTIC

BRAVO

GREAT

IDEAL

OUTRE

SUPER

ZOWIE



6 Character Answers:

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SUPERB

UNREAL



7 Character Answers:

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AWESOME

BIZARRE

HELLUVA

ILOVEIT

SURREAL



8 Character Answers:

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FANCIFUL



10 Character Answers:

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ASTOUNDING

OUTOFSIGHT

TREMENDOUS



15 Character Answers:

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TOOGOODTOBETRUE