Hi Mrs T and Dizoz,
Ridiculously, 3D was the first clue I got at the beginning of the week as I heard the homonym immediately but could not work out why it was correct. I still couldn't even after I got 29A but can now thanks to you. Still cannot work out why 12A is what it is but I suppose it must be.
Still struggling with 23A, I'm sure I know what to put in the grid but I have no idea why...