Most people just put 5 A or 3D, but even if they were just numbered 1,2 and 3, it's slightly easier to answer. It's not a major issue, just something I mentioned!
Just retrieved my paper from recycling...don't normally do this crossword. But just started it. 26a - drug record a cheat fills in 1-4 is L do p a- l dopa. 18 down is Them art - The Mart. 23d Group that's hidden old instrument - is Cell + O - cello
Hope this helps !