Stop note being sent to peer (7)
I believe the answer is:
baronet
'peer' is the definition.
(thesaurus)
'stop note being sent' is the wordplay.
'stop' becomes 'bar' (I've seen this before).
'being sent' is an anagram indicator (send can mean to excite or stimulate).
'note' anagrammed gives 'onet'.
'bar'+'onet'='BARONET'
'to' acts as a link.
(Other definitions for baronet that I've seen before include "Titled man" , "Lowest British hereditary title" , "Aristocrat" , "Nobleman" , "Member of the British order of honour" .)