Cryptic crossword No 851

Well I found that rather tough but got there! Although I failed to identify the author mentioned in your SI 🙃 I have a rule of never using the Reveal button, but the Check button got something of a workout towards the end! Your notes clarified the ones I got without fully parsing. Some favourite penny drops: 10a, 14a, 34a, 4d, 8d and 19d. A great mental workout! A couple of additional comments in the reply --->