Many thanks to both Chrise and Brendan
Of course after I posted, I got all the last ones, though I can't see the parsing for a couple including 3d. I know you have explained it, but I can't quite put it together.
Similarly, I can't see the parsing for 14d, but I'm sure it is right. I'd never heard of 15ac and can't quite parse that either.
But time to give up.
Tomorrow I must prepare my questions on plants. My husband is doing music and history/politics.