Thanks to Brummie for a truly enjoyable Prize.
26d - is the only clue I can't fully parse. I can see how the answer fits the "beginning to off" and "pickled", but don't get the "ham" part?
Oh, I actually spotted the theme! 😀
COD - I was going tp pick 9a but then I thought that maybe Brummie missed a trick here given that when boxers throw punches they could swing from either side (that's it Bren, tell an experienced and professional setter how to do his job!) so, instead, I've gone with beautiful 7d.