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All answers having "Gotcha!" as clue:

3 Character Answers:

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AHA

BOO

HAH

OHO

RHO

ZAP



4 Character Answers:

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AHSO

IDIG

ISEE

OKAY



5 Character Answers:

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NOTED

PSYCH

ROGER



6 Character Answers:

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AHISEE

IDIGIT

ISEEIT

OHISEE

SOISEE



7 Character Answers:

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ISEENOW



8 Character Answers:

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IHEARYOU



9 Character Answers:

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DULYNOTED

IMKIDDING

OHISEENOW