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SH. I am not at all certain about this but we are not talking about a true GS but an approximation based on arcs drawn in squares of size determined by the sequence first described by one of the thematic answers.
Late in the week so I hope this is not giving too much away but that sequence starts 0, 1, 1, 2…..
A square of size 0 cannot exist but we have two squares of size 1.
As I said at this level the approximation does not really work but I think we need to use the approximation rather than a true GS to follow the second instruction accurately.
I really hope this distinction will not affect the marking of correct puzzles.

One final moan about the preamble: the first instruction does not say whether delineation is required and if so, whether it is in one or two directions. At the moment, the only delineation I have added is to create the six new squares. This results in the answer to the "extra clue" being in the same (enlarged) cell. I think this is what the setter intended.
Any additional delineation would, in my opinion, detract from the elegance of the final solution. Does anyone else have a view on this?

Thanks!
9D---I feel very silly now. I was sure it was a homonym, and it blinded me to the anagram. Tut.
41A---That's pretty much what I thought, but I still don't understand the `eleven'. I must be missing something.
(Anyway, at least my grid and instructions are OK.)

Look up the changed letter in Chambers.

0pt0
I'm not sure I have fully understood what you mean by delineation, but saying that the answer to the extra clue is in the same (enlarged) cell does not sound right to me. You should have six new squares. The answer to the extra clue is entered in cells that span two of the new squares you should have created. I wonder if you have picked the right starting point in the grid for your extra clue answer?

oldwolfie, Listener setters are fond of “medieval Roman numerals” and O represents 11 in that system.

Twit, it seems from this forum that there are at least two distinct schools of thought on what is the "final cell". Probably due, in part, to ambiguity about the construction of the squares and arcs.

I'm with 0pt0. My extra across entry is in one new square.

Darla, thanks so much for this info. All clear now.

rhsl
I am sure you are absolutely right about there being different schools of thought on this because of ambiguity in the puzzle construction. For me, the biggest problem lies in the puzzle using the wrong word as the 6th word of the second instruction revealed by the extra words.
It will be interesting to see what they publish as the correct solution and how this is explained and marked.

Twit, when I said "delineation", I meant drawing grid lines, but I was trying not to be too specific. Also when I said "the answer to the extra clue" I meant just the two letters. I hope this clarifies things.