Well, I have just decided to look here for some ideas to finish off the crossword and what a to do. I have read lots about 2d/10a and realised no-one seemed to have entered what I thought until just now. For 10a I thought the anagrind referred to “and”, “earl” meant just e and then “has another one” referred back to “son” from previous clue, hence ellipsis, thus pluralising Dane to Danes meaning “has another one” could be doing double duty. I then took off the s because I went with Line for 2d where “mark?” could also mean a line.