I found this nowhere near as straight forward as those of recent weeks. There are a handful of clues related to Christmas, but not so many that I'd call it a theme.
I did initially think that the setter had made an error in 23a, but, after I checked in Chambers, and taken with the "next to" in the clue, I think it's probably Okay, but I'll be interested to hear what others think. Mind you, I wasn't helped by never having heard of the answer being used to describe an orange before.
The clues that held me up, aside from 23a, were 17d, not having come across it before, 22d, which I was convinced was a 'hidden' clue and 26a, mainly because I didn't have the crossing letters.
As always, please feel free to leave a comment or, if you get stuck, ask for a hint.
Merry Christmas