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All answers having "Crackerjack" as clue:

3 Character Answers:

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ACE

PRO



4 Character Answers:

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ACES

AONE

LULU

ONER

WHIZ



5 Character Answers:

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ADEPT

NEATO

TPEDA



6 Character Answers:

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EXPERT

MASTER

NAILER

SUPERB



8 Character Answers:

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JIMDANDY

WHIZBANG



10 Character Answers:

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JAMESDANDY



15 Character Answers:

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PLAYEROFTHEYEAR