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All answers having "Finally!" as clue:

3 Character Answers:

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ACE

AHA



4 Character Answers:

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FLOP

LAST



5 Character Answers:

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ATLAS

ATTIC

INSUM

WIDER



6 Character Answers:

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ATLAST

INDEBT

LASTLY

LEGACY



7 Character Answers:

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EXPUNGE

OLDNICK

OMINOUS

OPERATE



8 Character Answers:

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ATLENGTH

ATTHEEND

INTHEEND



9 Character Answers:

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ABOUTTIME



10 Character Answers:

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ATLONGLAST

ONCEFORALL



11 Character Answers:

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INTELLIGENT



12 Character Answers:

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INCONCLUSION

INTHELONGRUN



13 Character Answers:

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ONCEANDFORALL



15 Character Answers:

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LASTBUTNOTLEAST