Rim device constructed for rulers (9)

I believe the answer is:

decemviri

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'rulers' is the definition.
Both the definition and answer are plural nouns.
Perhaps you can see a link between them that I don't see?

'rim device constructed' is the wordplay.
'constructed' indicates anagramming the letters.
'rim'+'device'='rimdevice'
'rimdevice' with letters rearranged gives 'DECEMVIRI'.

'for' is the link.

Can you help me to learn more?

(Another definition for decemviri that I've seen is " Old magistrates".)

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

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