It makes light of being a beetle (7)

I believe the answer is:

firefly

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'beetle' is the definition.
(I know that firefly is a type of beetle)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for firefly that I've seen before include "Glower" , "One shining" , "Luminescent insect" , "Light horse-drawn carriage" , "Winged beetle - racing dinghy" .)

I've seen this clue in the Evening Standard.

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