Cryptic crossword No 3,549

While I have to admit I was stymied by 5d (extremely clever in retrospect, just very hard to sort out) and 6d (unfamiliar terminology), this was a phenomenal puzzle! Favorites included 2d (cheeky), 4d (had the right thought several minutes before I understood WHY it was the right thought), 17d, 8a (very clever), and 19a. Great work!