A keen follower receiving rice mostly from Nigeria, say (7)

I believe the answer is:
african
'nigeria say' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'a keen follower receiving rice mostly' is the wordplay.
'keen follower' becomes 'fan' (fan is a kind of follower. I am not sure about the 'keen' bit.).
'receiving' indicates putting letters inside.
'mostly' means to remove the last letter (most but not all of the word).
'rice' with its last letter taken away is 'ric'.
'fan' placed around 'ric' is 'frican'.
'a'+'frican'='AFRICAN'
'from' is the link.
Can you help me to learn more?
(Other definitions for african that I've seen before include "Can a fir have this nationality?" , "From one continent" , "Far Inca for this nationality" , "Continental" , "Kenyan, perhaps" .)
