Outside the range of female singer, with two final notes replaced by one in between (6)
I believe the answer is:
beyond
'outside the range of' is the definition.
(I've seen this before)
'replaced by one in between' is the wordplay.
'replaced' indicates an anagram.
'in between' becomes 'd' (I can't justify this - if you can you should believe this answer much more).
'by'+'one'='byone'
'byone' is an anagram of 'beyon'.
'beyon'+'d'='BEYOND'
'female singer with two final notes' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for beyond that I've seen before include "unknown" , "Better than" , "(The) hereafter" , "Farther than or outside" , "On the farther side - in addition" .)