There may be many calls on it to change the management (11)
I believe the answer is:
switchboard
'there may be many calls on it' is the definition.
I can't tell whether this definition defines the answer.
'change the management' is the wordplay.
'change' becomes 'switch' (switching is a kind of changing).
'the management' becomes 'board' (eg the board managing a business).
'switch'+'board'='SWITCHBOARD'
'to' is the link.
Can you help me to learn more?
(Other definitions for switchboard that I've seen before include "Manual telephone exchange" , "Where one may see call girl" , "Part of telecommunications network" , "Feature of exchange" , "Manual telephone connector" .)