This puzzle was a bit of a dog's breakfast for me … but I got there in the end!
No-one seems to have mentioned this but, to my mind, the second word in 1dn is redundant (possibly the first word too), unless there is a parsing that I haven't spotted.
Also, I can't work out the thematic word paired with 25ac, though I see that it is defined by the superfluous word in 26ac.
[There's been a lot of discussion as to who is the likely candidate for the superfluous word/definition in 11ac; to add to the confusion, when I was a nipper - 1960s - the character at 7ac definitely qualified!]