Change the directors and the office equipment (11)
I believe the answer is:
switchboard
'the office equipment' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'change the directors' is the wordplay.
'change' becomes 'switch' (synonyms).
'the directors' becomes 'board' (board of directors).
'switch'+'board'='SWITCHBOARD'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for switchboard that I've seen before include "Centre for telephone calls" , "Part of telecommunications network" , "means to getting the message across" , "Manual telephone exchange" , "Where one may see call girl" .)