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All answers having "Complain" as clue:

3 Character Answers:

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AIL

NAG

YAP



4 Character Answers:

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BEEF

CARP

CRAB

FRET

FUSS

HARP

KICK

MEMO

MOAN

RAIL

WAIL

YAUP

YAWP



5 Character Answers:

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BLEAT

CAVIL

GRIPE

GROAN

GROWL

THERE

WHINE



6 Character Answers:

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BEMOAN

GROUCH

GROUSE

KVETCH

LAMENT

MURMUR

REPINE

SQUAWK

YAMMER



7 Character Answers:

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GRUMBLE



8 Character Answers:

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LEATHERY



9 Character Answers:

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BELLYACHE



11 Character Answers:

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RAISEASTINK



12 Character Answers:

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MOANANDGROAN