Hold power (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
reign
'hold power' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for reign that I've seen before include "Rule - dominate" , "Rule of monarch" , "Wield the sceptre" , "are unbeatable!" , "Rule over in Niger" .)