Jono, I think the second 'about' in 17d refers to the meaning of the first two letters, which are then reversed by 'uprising'. I agree it's convoluted, but I think it just about works. Of course, its position is at the end of the clue since everything has been reversed by the first 'about'.
I agree with you about 'wrong'. The meaning of the whole clue is the opposite of 'austere', i.e., I think 'what is shown' refers to the answer itself.
I disagree that 8d is not a poem. It is akin to the verse dramas that T.S. Eliot wrote, a combination of the two genres.