Rule over the central part (6)
I believe the answer is:
govern
'rule over' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for govern that I've seen before include "Control, determine" , "Run" , "Control, influence" , "Rule or administer" , "Exercise authority over a people" .)