Set up office divided by metal screen (7)
I believe the answer is:
monitor
'screen' is the definition.
(computer screen)
'set up office divided by metal' is the wordplay.
'set up office' becomes 'motor' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'divided by' is an insertion indicator.
'metal' becomes 'Ni' (Ni is an example).
'motor' enclosing 'ni' is 'MONITOR'.
Can you help me to learn more?
(Other definitions for monitor that I've seen before include "Supervise" , "what a computer user may require" , "Keep track of" , "Display device" , "Police" .)