1: Terrier shows how to stray (3)
2: Hazardous emanation from river used by a crime boss (5)
3: Characters producing exit with cross? (9)
4: Half disapprove of old king (3)
5: Notes spent in Germany (5)
8: Sluggish trainer takes part (5)
9: Five in Christmas story (5)
11: Sheep to start wallowing in ease (3)
13: No one told sister (3)