Crossword Genius

Windows unsettle criminal (8)

Ross

I believe the answer is:

lunettes

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'windows' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'unsettle criminal' is the wordplay.
'criminal' is an anagram indicator.
'unsettle' with letters rearranged gives 'LUNETTES'.

Can you help me to learn more?

(Another definition for lunettes that I've seen is " spectacles".)

I've seen this clue in The Independent.
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