ManicMary, have you got the German dog? That was the biggest help for me.
2 D. Fish: school arrived. Charr. It's from Sch, school and Arr, arrived. The S, from school, is the additional letter.
13 A. Insolent Scots get angry about women (7) Sweered, inDolent. It's See red, get angry, with W, women.