All finished here (finally) but there’s three clues
- 16a “refractive science IP…”
- 21d “maybe this times writer’s…”
- 23d “ Asian herbaceous plants…”
where I have the def, the wordplay, the entry - but not the answer! I had the same problem with 20, but googling the definition + “crossword clue” turned up the solution. If anyone can think of a way to point me in the right direction, I’d be grateful.