Note gets repeated in soprano’s part (4)
I believe the answer is:
mimi
'soprano's part' is the definition.
(part for a soprano in the opera La boheme)
'note gets repeated' is the wordplay.
'note' becomes 'mi' (as in do-re-mi).
'gets' means one lot of letters go next to another.
'repeated' becomes 'mi' (I can't explain this - if you can you should believe this answer much more).
'mi'+'mi'='MIMI'
'in' is the link.
Can you help me to learn more?
(Other definitions for mimi that I've seen before include "I'm upset twice by the operatic girl" , "Tragic Parisienne" , "showgirl" , "Puccini's seamstress" , "I'm, I'm mad about the heroine in 'La Boheme'" .)