Can he possibly get the right note? (5)
I believe the answer is:
tenor
'can he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'possibly get the right note?' is the wordplay.
'possibly' is an anagram indicator.
'get' is a charade indicator (letters next to each other).
'the right' becomes 'r' (common abbreviation).
'r' put next to 'note' is 'rnote'.
'rnote' is an anagram of 'TENOR'.
Can you help me to learn more?
(Other definitions for tenor that I've seen before include "Caruso or Domingo" , "Singer; drift" , "thread" , "Placido Domingo, say" , "Big bell" .)