Black American repressed over feudal code (7)
I believe the answer is:
bushido
'feudal code' is the definition.
(code of the samurai in feudal Japan)
'black american repressed over' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'american' becomes 'us' (abbreviation for United States).
'repressed' becomes 'hid' (repress can mean to hide or ignore).
'over' becomes 'o' (cricket abbreviation).
'b'+'us'+'hid'+'o'='BUSHIDO'
(Other definitions for bushido that I've seen before include "code out east" , "honourable code" , "Japanese code of chivalry" , "Fighters' code" , "Strict ethical code of Japanese samurai" .)