After eventually shelving this yesterday because of those 3 pesky clues, I finish it off in 10mins this morning. I spotted a bigger problem in that I had entered an incorrect letter (one that doesn't even exist in the answer!) in the cell for the start of the final word in the 1st ring. Once I spotted that I immediately knew what that final word was and everything fell into place. I only have a very small gripe, but it did hold me up for quite a while, and that is that "pots" in ring clue 40 seems, to me at least, to be stretching it a bit for a fair definition.