Thanks! I wondered about 1A as well. Your suggestion for 5A was also one which I thought of, but it doesn't fully convince me either, since is more of a collocation than a *saying*. There is a third possibility, which is things which could be found on the seabed, but this is also more of a collocation than a *saying*. On balance, I slightly favour lecrack's one, since it is at least part of a saying which relates not to untrainable elderly canines, but to someone who is repeating disreputable behaviour. However, it is only *part* of this saying, whereas the other saying in the puzzle is complete. An ultimately unsatisfactory puzzle, then. Had I been the crossword editor, I would not have let it pass, but the editor in this case (Doc) has previous himself: I am still smarting over the unclued 'Hanny and Nanny' in his Enid Blyton puzzle, since she never published a book with this English title (the German titles of the 'St. Clare's' series include 'Hanni und Nanni' [sic]).