Singer to hold back one note (8)
I believe the answer is:
baritone
'singer' is the definition.
(baritone is a kind of singer)
'hold back one note' is the wordplay.
I cannot really understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
an anagram of 'note' is 'tone' which is located in the answer.
The remaining letters 'bar' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for baritone that I've seen before include "Male singer looks odd in boater" , "Male singer in boater, strangely" , "One who can sing" , "Second lowest male singing voice" , "Male voice between bass and tenor" .)