Heard notes from singers (6)
I believe the answer is:
tenors
'singers' is the definition.
(tenor is a singing voice)
'heard notes' is the wordplay.
'heard' shows a homophone (sound like).
'notes' becomes 'tenners' (ten pound notes).
'tenners' is a homophone of 'TENORS'.
'from' acts as a link.
(Other definitions for tenors that I've seen before include "Male singing voices" , "Male singers with high register" , "Male singers from Reston" , "Opera singers" .)