To be one, this administrator must have two others (8)

I believe the answer is:

triumvir

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'to be one this administrator must have two others' is the definition.
'triumvir' can be an answer for 'administrator' (triumvir is a kind of administrator). I am not sure about the rest of the definition.

This is the entire clue.

Can you help me to learn more?

(Another definition for triumvir that I've seen is " One of Rome-ruling trio".)

I've seen this clue in The Telegraph.

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