I've got 2 abbreviated days of the week in the right hand side of the grid, each 3 letters, one the day after the other, and following the same 'pattern' (or trajectory, perhaps), but they're not connected and it seems to be the wrong outcome. However, given the wording of the second Chambers def of the theme phrase, it's interesting that there are quite a few anagrams of 'things' in the grid..? ( but none being 'exactly the same', to refer to the def)