Peer to stop note being played (7)
I believe the answer is:
baronet
'peer' is the definition.
(I've seen this before)
'stop note being played' is the wordplay.
'stop' becomes 'bar' (bar can mean to stop or prevent).
'being played' indicates anagramming the letters.
'note' anagrammed gives 'onet'.
'bar'+'onet'='BARONET'
'to' acts as a link.
(Other definitions for baronet that I've seen before include "Hereditary knight" , "One's entitled" , "Sir Somebody-or-other?" , "Member of the British order of honour" , "A Breton could be a British peer" .)