Looks at books (6)
I believe the answer is:
audits
This clue could be a double definition.
'looks' is the first definition.
The answer and definition can be both related to thinking as well as being verbs in their -s form.
Perhaps there's an association between them I don't understand?
'books' is the second definition.
The answer and definition can be both related to property as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'at' acts as a link.
Can you help me to learn more?
(Other definitions for audits that I've seen before include "Balancing checks" , "examinations" , "Checks accounts for accuracy, perhaps annually" , "Examination of accounts" , "Inspections of accounts" .)