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All answers having "Beetle" as clue:

3 Character Answers:

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BUG

CAR

DOR

ELM



4 Character Answers:

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AUTO

DORR

DUNG

STAG



5 Character Answers:

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CARAB

LARVA

VWBUG



6 Character Answers:

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ELATER

INSECT

SCARAB

WEEVIL



7 Character Answers:

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ELASTIC

JUNEBUG

LADYBUG



8 Character Answers:

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LADYBIRD



13 Character Answers:

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CARBONDIOXIDE