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All answers having "Find fault with" as clue:

3 Character Answers:

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NAG

PAN

RAP



4 Character Answers:

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BASH

CARP



5 Character Answers:

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BLAME

CAVIL

NAGAT

SCOLD



6 Character Answers:

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PICKAT



7 Character Answers:

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NITPICK

SNIPEAT



9 Character Answers:

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CRITICISE

PICKAPART

REPREHEND



11 Character Answers:

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SQUAWKABOUT



13 Character Answers:

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COMPLAINABOUT



15 Character Answers:

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TAKEEXCEPTIONTO