He sings a note for you to hear (5)
I believe the answer is:
tenor
'he sings a' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'note for you to hear' 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 understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tenor that I've seen before include "Male voice (one of three?)" , "character" , "range of 14 across [GIGLI]" , "theme" , "Voice classification of Jose Carreras" .)