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All answers having "Acknowledge" as clue:

3 Character Answers:

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OWN



4 Character Answers:

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AVOW

NOTE



5 Character Answers:

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ADMIT

COPTO

GRANT

LETON

NODTO

OWNTO

REACT

REPLY

THANK



6 Character Answers:

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ACCEPT

CREDIT

TOOTAT

WINKAT



7 Character Answers:

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ADMITTO

CONCEDE



9 Character Answers:

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RECOGNIZE



15 Character Answers:

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MAKEACONFESSION