Singer vocalising a note spent (5)
I believe the answer is:
tenor
'singer' is the definition.
(tenor is a kind of singer)
'vocalising a note spent' is the wordplay.
I cannot quite see how this works, but
an anagram of 'note' is 'teno' which is located in the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tenor that I've seen before include "Singer (one of three?)" , "Voice classification of Jose Carreras" , "Higher male voice" , "Voice of Tamino" , "character" .)