Don's surname (anag) — aria from a Puccini opera (6,5)

I believe the answer is:

nessun dorma

(Other definitions for nessun dorma that I've seen before include "Aria from Puccini's opera Turandot" , "Famous Puccini aria (Turandot)" , "Well-known aria from Turandot" , "air" .)

I've seen this clue in The Guardian.

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