The most common and most likely answer to this crossword clue is the 9 letter word LADYBIRDS
I've seen this crossword clue in The Times
L
A
D
Y
B
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R
D
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More clues leading to the result LADYBIRDS
Buddy explains!

The straight part
We know that "beetles" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case beetles = ladybirds.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does LADYBIRDS mean?
LADYBIRDS noun- Any of the Coccinellidae family of beetles, typically having a round shape and red or yellow spotted elytra.