How complicated this all is. It took me ages. I drew the grid on a piece of squared paper and armed myself with a pencil, not the usual pen, then started by solving as many of the clues as possible. Since I got two of the ten-letter answers I took a punt and pencilled them in at right angles to each other — there was a letter that fit both words where they crossed. Then I tentatively added the answers that I had and went on until things went wrong. For the second time I was lucky and the only wrong positioning quickly led to a dead end, and I could retrace my steps. I went on and on and to my surprise it all worked out OK, although I was very fortunate: similar such things have in the past led me to start all over again.
Definitions in crimson, underlined. Anagram indicators in italics.