Enjoyed this, especially the general favourites, 19 and 13, but did struggle, namely with 11a (thanks Jono for your hints, which enabled me to solve it) and 9a. I have the answer for 9a but have no idea about the parsing, so I am obviously missing something (especially as Brendan cited it as one of his favourites).
Took me ages to see the anagram in 1a, but thought that was a good one when I did. Likewise 5d - didn't realise that was an anagram until I'd biffed the answer.