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All answers having "Terrific" as clue:

3 Character Answers:

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OLE

RAD

WOW



4 Character Answers:

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AONE

NEAT

PHAT



5 Character Answers:

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BOFFO

GREAT

SOCKO

SUPER

SWELL



6 Character Answers:

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SUPERB



7 Character Answers:

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AWESOME



8 Character Answers:

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FABULOUS



10 Character Answers:

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TREMENDOUS



15 Character Answers:

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THECATSWHISKERS