Stick with one note for singer (8)
I believe the answer is:
baritone
'singer' is the definition.
(I know that baritone is a type of singer)
'stick with one note for' is the wordplay.
'stick' becomes 'bar' (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'one' becomes 'I' (Roman numeral).
'note for' becomes 'tone' (I can't justify this - if you can you should give a lot more credence to this answer).
'bar'+'i'+'tone'='BARITONE'
Can you help me to learn more?
(Other definitions for baritone that I've seen before include "Male singer between tenor and bass" , "Second lowest male singing voice" , "One who can sing" , "Male voice with deep register" , "Male singer in boater, strangely" .)