Learned grain contained only half the bran (8)
I believe the answer is:
cerebral
'learned' is the definition.
(I know that learned can be written as cerebral)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cerebral that I've seen before include "Highly intellectual" , "Intellectual, brainy" , "Concerning the brain" , "Relating to the brain" , "Of the brain, intellectual" .)