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All answers having "Biting insect" as clue:

4 Character Answers:

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FLEA

GNAT

HFLY



5 Character Answers:

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ANGST

ELDER

MIDGE



6 Character Answers:

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DIADEM



7 Character Answers:

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FIREANT

SKEETER



8 Character Answers:

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HORSEFLY

MOSQUITO



11 Character Answers:

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GALLINIPPER



12 Character Answers:

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ACADEMYAWARD

SUPERCILIOUS



13 Character Answers:

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IDENTICALTWIN

SWEETNOTHINGS