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All answers having "Hold on ---!" as clue:

3 Character Answers:

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AMO

BRB



4 Character Answers:

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ASEC

LAST

PUTA

WAIT

WHOA



6 Character Answers:

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ADHERE

INASEC

NOTYET

NOWAIT

ONESEC



8 Character Answers:

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JUSTASEC

WAITASEC



9 Character Answers:

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ONEMINUTE



11 Character Answers:

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WAITAMINUTE



15 Character Answers:

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ONEMOMENTPLEASE