11a and 3d held me up for ages, but all done now. Sorting out the extra letters and the additional words proved, for me at least, a little tricky at times. A few quirky words in the grid and obscure definitions nicely added to the difficulty.
Less than an hour
Non-words in the grid
Not sure why we've had to resort to two doubke-unched 5s in a grid this simple
And the icing on the cake being the non unique solution.
Ok i haven't read this thread because i was going to have a go at this. What is the point of identifying clues by primes or cubes or squares? You may as well have put an asterisk beside them.
I enjoyed this. Yes, it's at the easier end of the range (not a bad thing, surely?) but it's an ingeniously constructed puzzle. I hope Augeas isn't put off by the negative stuff!