Quiet inmate's high position (9)
I believe the answer is:
president
'high position' is the definition.
'President' can be an answer for 'position' (President is an example). I am not sure about the 'high' bit.
'quiet inmate's' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'inmate' becomes 'resident' (I've seen this before).
'p'+'resident'='PRESIDENT'
Can you help me to learn more?
(Other definitions for president that I've seen before include "Cleveland?" , "Head, of a republic say" , "Our head of state has a strange red instep" , "Leader of a republic" , "The chief executive of a republic" .)