Singer’s note read out (5)
I believe the answer is:
tenor
'singer's' is the definition.
(tenor is a kind of singer)
'note read out' is the wordplay.
'note' becomes 'tenner' (a tenner is a 10 pound note).
'read out' indicates a 'sounds like' (homophone) clue.
'tenner' is a homophone of 'TENOR'.
(Other definitions for tenor that I've seen before include "Drift of thought" , "Voice of Tamino" , "Singer; drift" , "intent" , "Male singer with high-pitched voice" .)