I should’ve considered ‘non-zero’ in the sense of ‘not equal to zero’.

With hindsight, of course, it’s rather obvious!

In 13ac, I’m wondering about the definition ‘Real’ and the solution ‘NON-ZERO’.

In mathematics, zero is a real number:

http://en.wikipedia.org/wiki/Real_number

Thanks to IO for entertaining me greatly while proving that my brain still works and to PeeDee for the blog.

]]>7ac: I agree with PeeDee’s explanation (I agree with all of the others as well, but he expressed doubt about this one).

13ac: My one grumble with this crossword. Nero was a real person, but the story of him fiddling while Rome burnt is almost certainly untrue: at best he will have played a plucked stringed instrument such as a lyre. To me, that means we need some indication of the dubious nature of the definition.

5dn: When solving, I wondered if “on” was doing double duty here, but *Chambers* 2008 gives **pointe** as “the extreme tip of the toe, or the position of standing on it”, so “tiptoe” is a sufficient definition.

Thanks,

Rowly.