Opera contains English character and German aria (6,5)
I believe the answer is:
nessun dorma
'aria' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'opera contains english character and german' is the wordplay.
'opera' becomes 'norma' (I've seen this before).
'contains' indicates putting letters inside.
'english character' becomes 'ess' (the letter S. I am not sure about the 'english' bit.).
'and german' becomes 'und' ('and' in German).
'ess'+'und'='essund'
'norma' going around 'essund' is 'NESSUN DORMA'.
Can you help me to learn more?
(Other definitions for nessun dorma that I've seen before include "air" , "Well-known aria from Turandot" , "Aria from Puccini's opera Turandot" , "Famous Puccini aria (Turandot)" .)