Ok ok I give up! I’m pretty happy with the grid fill (although my parsing for 32A has a slight question mark)
I’ve read through the various hints but still can’t get this so if anyone would be kind enough to give a more direct hint for the phrase or the word that would be much appreciated.
I was thinking I was looking for the name of a group of the disappearing things but can’t see the obvious word for that or what the phrase would be.