1: Get sick chasing a grand lady's maid (7)
2: Good eater has more gut upsets (7)
3: Agrees that a course should be forwarded to the primary school (7)
4: Aquatic plant providing a variety of materials (5,4)
5: Grow, taking head of iceberg to show again (5)
6: Yeller eats two steak bones as Elly May's pet (7)
8: Left out cheese for parasites (7)
13: Bird and man going different ways (9)
15: Mug returns to 100 degrees, causing an ulcer. (7)
16: Distinct identity based in circumstance (7)
17: Duck turning up initially looking like a Walt Disney animated goose (7)
19: Dirt caught in footwear (7)
20: British actor in Rocky VII role (7)
21: 8-down Its the exception to everything else in the dish tub (7,4)