Manager installing one item of office equipment (6)
I believe the answer is:
copier
'office equipment' is the definition.
(I've seen this before)
'manager installing one' is the wordplay.
'manager' becomes 'coper' (someone who manages or copes).
'installing' indicates putting letters inside (inserted letters are installed).
'one' becomes 'i' (Roman numeral).
'coper' going around 'i' is 'COPIER'.
'item of' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for copier that I've seen before include "Machine for making duplicates" , "unoriginal type" , "Machine to reproduce print" , "Office item" , "Machine for making facsimiles" .)