Person with deeds that'll crash office network? (9)
I believe the answer is:
landowner
'person' is the definition.
(landowner is a kind of person)
'office network?' is the wordplay.
'office' becomes 'land office' (land office is a kind of office).
'network?' becomes 'owner' (I am not sure about this - if you are sure you should believe this answer much more).
'land'+'owner'='LANDOWNER'
'with deeds that'll crash' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for landowner that I've seen before include "One with title to an area" , "One possessing estate" , "One with estates" , "man of property" , "One with much property" .)