Means of measuring kings and queens? (6)
I believe the answer is:
rulers
'kings and queens?' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for rulers that I've seen before include "Straight sticks for governors" , "Those in power" , "Sovereigns etc" , "Sticks marked off in units" , "Drawing sticks or monarchs" .)