Measuring device for king or queen? (5)
I believe the answer is:
ruler
I believe this is a double definition.
'measuring device' is the first definition.
(I've seen this in another clue)
'king or queen?' is the second definition.
(I've seen this in another clue)
'for' is the link.
(Other definitions for ruler that I've seen before include "Strip used in drawing straight lines" , "It can be used to strike" , "Thoroughly straight" , "Drawing stick or monarch" , "Controller" .)