13a - 5 letter word for "shaves" (as in you might do the skin of a fruit) reversed/'back' - definition is a retired (I think) British "ballet dancer" although I think he was known more for other types of dance and appeared in some Lloyd Webber productions.
Thanks Brendan - yes, I have indeed heard of 13 : I was totally barking up the wrong tree looking for a six letter ballet that I could 'shav' the back letter off to get some dancer!
29a ... of course. Not sure how I missed that.
It's just occurred to me that with our favourite pop diva at 18a, you can in fact make two completely different 'Uxbridge English Dictionary'-words by adding 'ry' and 'ish' ! :-)