10ac Finally, once or twice, page-turning Cosi Fan fan? (5-4)
O?E?A-?O?R
I think it must be OPERA-something, but I have gone completely blank on what the second word might be. Any suggestions, please?
Hopefully it will help if you know it's an anagram of "e" (finally once) "or" twice and "page" and you are right about the opera bit. Who would be a fan of Cosi Fan Tutti?
1ac is a classic example of a Paul clue - guess the answer, then try to explain it. I don't think many wold be able to work "forwards" through it, though it does in fact make sense.