Twm - the wordplay for 25ac is again not very precise; the "type of opera" is not complete. The qualification I took to be the second and third letters of the answer
I don't know enough about Opera to be confident about the operatic refference - I got the answer from "Region" then recognissed the Qualification (as you said, letters 2£3 in it), thenassumed that the surrounding word was an operatic term..