Crossword Genius

A straight-edge king (5)

Ross

I believe the answer is:

ruler

This clue is a double definition.

'a straight-edge' is the first definition.
(I've seen this before)

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

(Other definitions for ruler that I've seen before include "Queen, say" , "Drawing stick or monarch" , "Monarch - straightedge" , "One who commands - often seen in the classroom" , "Potentate" .)

I've seen this clue in the Sydney Morning Herald.
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