Crossword Genius

Straight regulation? (4)

Ross

I believe the answer is:

rule

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'straight' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'regulation?' is the second definition.
(I know that regulation can be written as rule)

Can you help me to learn more?

(Other definitions for rule that I've seen before include "Regulation, reign" , "Govern the straight edge?" , "Control, government" , "Dominion" , "Control; printed line" .)

I've seen this clue in The Irish News.
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