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All answers having "Gigantic" as clue:

3 Character Answers:

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BIG



4 Character Answers:

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EPIC

HUGE

VAST



5 Character Answers:

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LARGE

MELON

TITAN



7 Character Answers:

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MAMMOTH

MASSIVE



8 Character Answers:

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COLOSSAL

ENORMOUS

WHOPPING



9 Character Answers:

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CYCLOPEAN

MONSTROUS

OVERSIZED

TEXASSIZE



10 Character Answers:

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MONUMENTAL



17 Character Answers:

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CARRIAGELUDICROUS