Note heard from singer (5)
I believe the answer is:
tenor
'singer' is the definition.
(tenor is a kind of singer)
'note heard' is the wordplay.
'note' becomes 'tenner' (a tenner is a 10 pound note).
'heard' indicates a 'sounds like' (homophone) clue.
'tenner' sounds like 'TENOR'.
'from' is the link.
(Other definitions for tenor that I've seen before include "theme" , "General meaning of a male voice" , "General drift or meaning" , "Male singer with high-pitched voice" , "Singer; drift" .)