African river drained and diverted (7)
I believe the answer is:
rwandan
'african' is the definition.
(Rwanda is an African country)
'river drained and diverted' is the wordplay.
'river' becomes 'r' (abbreviation for river).
'drained' becomes 'wan' (I am not sure about this - if you are sure you should believe this answer much more).
'diverted' indicates an anagram (each letter get diverted elsewhere).
'and' anagrammed gives 'dan'.
'r'+'wan'+'dan'='RWANDAN'
Can you help me to learn more?
(Other definitions for rwandan that I've seen before include "African chap" , "Kigali native, perhaps" , "African native" , "Eg, a native of Kigali" , "From a central African country" .)