You may get the drift of what he sings (5)
I believe the answer is:
tenor
'you may get the drift of what he sings' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for tenor that I've seen before include "Male voice (one of three?)" , "thread" , "Eg, Placido Domingo" , "Voice classification of Jose Carreras" , "Male singer with high-pitched voice" .)