Sees what the guidebooks said to see (6)

I believe the answer is:

sights

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'sees' is the definition.
The answer and definition can be both to do with perception as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for sights that I've seen before include "Things worth seeing" , "Places of interest for tourists" , "Visual perceptions" , "they look ridiculous" , "Spectacles" .)

I've seen this clue in the Evening Standard.

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