Heard note from a singer (5)
I believe the answer is:
tenor
'a singer' is the definition.
(I know that tenor is a type of singer)
'heard note' is the wordplay.
'heard' shows a homophone (sound like).
'note' becomes 'tenner' (a tenner is a 10 pound note).
'tenner' is a homophone of 'TENOR'.
'from' is the link.
(Other definitions for tenor that I've seen before include "Male voice (one of three?)" , "Eg, Placido Domingo" , "General meaning of a male voice" , "range of 14 across [GIGLI]" , "High male singing voice like Pavarotti" .)