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Opinions please. The clue is:
6a. Notes problem about one chapter. (5).
I thought REACH might be a likely solution.
About = re, one chapter= a ch, and failing to reach top C could be described as a notes problem.
But no. It would appear that the middle letter is an S and now I'm stumped. Any help gratefully received.
Aux 1

I think it's Music
Sum (backward)+i/one+c/chapter.

That would be absolutely correct. Thanks heaps.
Aux 1.