Louvre, German agreed, more insect-infested? Not quite (8)

I believe the answer is:

jalousie

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'louvre' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for jalousie that I've seen before include "Louvred window" , "Slatted blind or shutter" .)

I've seen this clue in The Times.

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