Crossword Genius

Sovereign for stationery item (5)

Ross

I believe the answer is:

ruler

I believe this is a double definition.

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

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

'for' acts as a link.

(Other definitions for ruler that I've seen before include "It can be used to strike" , "that should go straight" , "Stationery item" , "Strip used in drawing straight lines" , "' - - of the Queen's Navee!'" .)

I've seen this clue in The Mirror.
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