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All answers having "Knock down" as clue:

3 Character Answers:

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MOW



4 Character Answers:

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APEG

DECK

DROP

EARN

FELL

RASE

RAZE



5 Character Answers:

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FLOOR

LAYOW

LEVEL

UPEND

UPSET



6 Character Answers:

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BASHIN

DEBASE

DEFAME

DEMOTE

LAYLOW

TOPPLE



7 Character Answers:

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DEVALUE

FLATTEN

RUNOVER



8 Character Answers:

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DEMOLISH



9 Character Answers:

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OVERTHROW