Singers producing notes for the audience (6)
I believe the answer is:
tenors
'singers' is the definition.
(tenor is a kind of singer)
'notes for the audience' is the wordplay.
'notes' becomes 'tenners' (ten pound notes).
'for the audience' indicates a 'sounds like' (homophone) clue.
'tenners' sounds like 'TENORS'.
'producing' acts as a link.
(Other definitions for tenors that I've seen before include "Male singing voices" , "Male singers from Reston" , "Male singers with high register" , "Opera singers" .)