Answers are all rivers or flowers (flowers not necessarily Scottish)
30) Rowers eat Aylesbury regularly.(9)
41) Fashionable first Kaiser - tiny German (9)
51) Found growing around wide bend
59) Potassium openly combines with element without any work (5,5)
78) Appropriate shape for a Pharoah's ball (9,6)
76) This hawk is tiny in the margins of treated material (6,5)