Crossword Genius

Heavy mallets used for crushing insects (7)


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'insects' is the definition.
(beetle is a kind of insect)

I don't understand the rest of the clue.

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(Other definitions for beetles that I've seen before include "Lets bee turn to insects" , "Four-winged insects" , "Bet eels could turn into insects" .)

I've seen this clue in The Telegraph.
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