Shape of extremely simplistic, unethical president (6)
I believe the answer is:
sculpt
'shape' is the definition.
(sculpting is a kind of shaping)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for sculpt that I've seen before include "Model" , "Carve a shape" , "Carve (into artistic form)" , "Carve in wood or stone" , "Create by shaping a material" .)