A rule I instilled in fellow African (8)
I believe the answer is:
malawian
'african' is the definition.
(person from Malawi)
'a rule i instilled in fellow' is the wordplay.
'rule' becomes 'law' (law is a kind of rule).
'instilled in' indicates putting letters inside.
'fellow' becomes 'man' (I've seen this before**).
'a'+'law'+'i'='alawi'
'alawi' inserted into 'man' is 'MALAWIAN'.
(Other definitions for malawian that I've seen before include "From statesman" , "African" .)