It was all going so well until the extra clue which has had had me foxed for a couple of days now. I have not given up yet but need to narrow down the options.
I have made some assumptions.
1) that the clue is a normal type with a definition and wordplay for 2 letters of a four letter word.
2) as far as I can see no letters are to be changed and none have been removed from the grid so the two clued letters must be on two new cells to the left or right of the grid. I suspected they may have to be linked to the result of the last instruction but can’t see how.
Are these assumptions correct?
Finally I have constructed 6 arcs but only 5 new squares. My first arc is drawn in the existing square containing the original grid. Is that correct?