Those viewable with spectacles? (6)

I believe the answer is:

sights

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'spectacles?' is the definition.
(sight can mean a visual spectacle)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sights that I've seen before include "Landmarks" , "Places of interest for tourists" , "they look ridiculous" , "Visions, views" , "Spectacles" .)

I've seen this clue in the Evening Standard.

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