Cryptic crossword No 1,495

Thanks for this, Ozof. Lots of interesting ideas here, and some devious definitions. My top 3: 21a (nice surface + wordplay), 26a (satisfying), 4d (nice definition). I must admit, I found this rather tough. I had to check the parsing of some in your notes, and, having done so, I can see why I found it so tricky. Spoilers follow...