Possible Clues:

• African flower lasts without endless resin for one
• Central African river
• River flowing over Victoria Falls
• Southern Africa river
• Fourth longest African river
• It sounds as if it's easy to get to the end of this big flower
• River of southeast Africa
• African river, flowing into the Indian Ocean
• River along the Zambia-Zimbabwe border
• Snoring over broken beam with one Congolese flower