African fish's name maybe grasped by sailors (7)
I believe the answer is:
'african' is the definition.
(Rwanda is an African country)
'fish's name maybe grasped by sailors' is the wordplay.
I cannot really understand how this works, but
'name' could be 'wanda' and 'wanda' is found within the answer.
'sailors' could be 'rn' (abbreviation for Royal Navy) and 'rn' is found within the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for rwandan that I've seen before include "From a central African country" , "African chap" , "Kigali native, perhaps" , "Eg, a native of Kigali" , "African native" .)