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All answers having "So!" as clue:

3 Character Answers:

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AHA

AND

ARE

CAL

HOW

NOT



4 Character Answers:

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BEIT

ERGO

EVEN

ISEE

ITIS

ROOM

SOON

THAT

THEN

THUS

TRUE

VERY

WHAT



5 Character Answers:

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ANDSO

HENCE

QUITE

SOAND

SUEME

TAINT

THERE



6 Character Answers:

---

THUSLY

WHATOF



8 Character Answers:

---

SUCHTHAT

WHOCARES



9 Character Answers:

---

THEREFORE



11 Character Answers:

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ISTITCHABIT



13 Character Answers:

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INCONSEQUENCE



15 Character Answers:

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WHATSTHEBIGDEAL

WHATSTHEPROBLEM