Crossword Genius

A sovereign for a stationery item (5)

Ross

I believe the answer is:

ruler

This clue is a double definition.

'a sovereign' is the first definition.
(I've seen this before)

'stationery item' is the second definition.
(I've seen this before)

'for a' acts as a link.

(Other definitions for ruler that I've seen before include "One who commands - often seen in the classroom" , "Measuring tool" , "person holding sway?" , "Person in authority" , "Strip used in drawing straight lines" .)

I've seen this clue in The Mirror.
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