A few I can’t parse. SPOILER: contains answers.
3D has a taste of course in Leon: pimentos without stuffing. (4). I have SIPS but can’t see the parsing.
12a. Ditches; gets ready for new partner. (4). Ruts?
21a. Seed-spiller gets back to back in a trice. (10). Nanosecond. Don’t understand seed-spiller.
Thanks.