He can sing ten more, but without me (5)
I believe the answer is:
tenor
'he can sing ten more' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'without me' is the wordplay.
I cannot really understand how this works, but
'without' could be 'no' and 'no' is present in the answer.
The remaining letters 'ter' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'but' acts as a link.
Can you help me to learn more?
(Other definitions for tenor that I've seen before include "Voice of Tamino" , "Pitch range" , "Drift of thought" , "One singing" , "General meaning of an utterance" .)