Sovereigns and marked sticks (6)
I believe the answer is:
rulers
'sovereigns and marked sticks' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rulers that I've seen before include "Those in power" , "Strips with straight edge to measure" , "Drawing sticks or monarchs" , "Measuring sticks" , "Kings, queens, presidents etc" .)