Opera about English ship, and German aria (6,5)
I believe the answer is:
nessun dorma
'aria' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'opera about english ship and german' is the wordplay.
'opera' becomes 'norma' (I've seen this before).
'about' is an insertion indicator.
'english' becomes 'E' (abbreviation).
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'and german' becomes 'und' ('and' in German).
'e'+'ss'+'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 "Well-known aria from Turandot" , "air" , "Aria from Puccini's opera Turandot" , "Famous Puccini aria (Turandot)" .)