Crossword Genius

It makes a straight line for the sovereign (5)

Ross

I believe the answer is:

ruler

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

'a straight line for the sovereign' is the wordplay.
'a straight line' becomes 'rule' (I've seen this in another clue).
'for' is a charade indicator (letters next to each other).
'the sovereign' becomes 'r' (abbreviation for rex or regina, king or queen).
'rule'+'r'='RULER'

'makes' acts as a link.

Can you help me to learn more?

(Other definitions for ruler that I've seen before include "provider of measured information" , "Queen maybe" , "Governor or drawing stick" , "Source of line" , "Man in charge" .)

I've seen this clue in The Mirror and The Daily Express.
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