E-genius? (7)
I believe the answer is:
egghead
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for egghead that I've seen before include "scholar" , "Ovoid-shaped intellectual" , "Brainy type" , "Heed gag about slang intellectual" , "Intellectual (colloq.)" .)