Rule, control (6)
I believe the answer is:
govern
This clue is a double definition.
'rule' is the first definition.
(I know that rule can be written as govern)
'control' is the second definition.
(to govern is to control or rule over)
(Other definitions for govern that I've seen before include "Rule over or regulate" , "'Rule over, control (6)'" , "Control, influence" , "Be in power" , "Manage - control" .)