In the old days you would be found in the document he examined (4)
I believe the answer is:
thee
'in the old days you would be' is the definition.
I know nothing about this answer so I can't tell whether this works.
'in the document he examined' is the wordplay.
'in' indicates a hidden word.
'THEE' is hidden within 'document he examined'.
'found' acts as a link.
Can you help me to learn more?
(Other definitions for thee that I've seen before include "You in the olden days" , "Quaker 'you'" , "Archaic form of 'you'" , "Old objective second person singular" , "you many years ago" .)