Thanks to will37's help in discovering the play, I managed to complete this (correctly, I think!). However I just don't understand an unusually large number of, mostly, the cryptic parts of the answers in this one -
22A: provided at college?
26A: Theatric Nobelist stays quiet?
30A: shut up in a sea? I was looking for a SH somewhere....
35A: why a fine lady?
36A: what bird is out of place?
3D: my answer is a noun, whereas nasty is an adjective. And while I get the tear gas part, how does the rest of it work?
12D: what has the answer got to do with a greenhouse?
I can't remember ever having so many problems with a Speccie's answers.
By the way, I was intrigued to see a couple of you talking about starting with parents at the age of 12. Same for me too, 50 years ago. I still remember the first clue I solved by myself - Dutch cheese made backwards (4). So easy now, but I was so pleased with myself then!
Thank you all for your help from time to time. It is so annoying not fully understanding an answer even if you have it correct.