His song never ends (3)
I believe the answer is:
son
'his' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'song never ends' is the wordplay.
'never ends' means to remove the last letter (I've seen 'never ending' mean this).
'song' with its last letter taken off is 'SON'.
Can you help me to learn more?
(Other definitions for son that I've seen before include "Male descendant" , "Young boy" , "The kind of child" , "A relative" , "Heir" .)