Hi Simond9x
To give the complete picture:
1. I have 3 clashing cells. I haven't solved 19D which I assume would give me the 2 remaining clashing cells (if not, I have gone badly astray!).
2. I have identified 17 of the 20 unclued letters; I have 2 or 3 clues that I have not been able to parse.
3. Not only do I not have all the letters of the jumbled word, but I can't make much sense of the initial unclued letters I do have.
In light of all this, and that I suspect the endgame involves a GWIT element too big for me to penetrate, I think I am sensible to call it a day on this one. Since this is a normal occurrence for me that's absolutely fine. I will be waiting to see the solution with interest!