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All answers having "Bloodsucking insect" as clue:

3 Character Answers:

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ODE



4 Character Answers:

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FLEA



5 Character Answers:

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BLUES

FILMS

LOUSE

TRUSS



6 Character Answers:

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BEDBUG

SERAPH



7 Character Answers:

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SECTION

WRINGER



9 Character Answers:

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TSETSEFLY