They are used for crushing insects (7)

I believe the answer is:

beetles

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

I don't understand how the rest of the clue works.

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

I've seen this clue in The Irish Independent.

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