Crossword Genius

Reign over the interior (6)

Ross

I believe the answer is:

govern

I'm a little stuck... Click here to teach me more about this clue!

'reign over' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for govern that I've seen before include "Control and direct the affairs of" , "Rule over or regulate" , "Check; rule" , "'Rule over, control (6)'" , "Exercise authority over a people" .)

I've seen this clue in the Evening Standard.
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