I'm stuck at the bottom right of the grid, where Dean Mayer seems to be obsessed by bones:
20d Arrangement of bones makes us look bad? (6) ?A?S??
27a Ordinary bag of bones (6) ???E?L
Thanks to you clever respondents. I don't think either clue/answer merits more than 3 out 10 for comprehensibility and elegance. No change there then for D. Mayer.