Group supplying pronouns (northerner's first) (4)

I believe the answer is:

unit

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'group' is the definition.
(I know that unit is a type of organisations)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for unit that I've seen before include "Part of a kit" , "army group" , "Module" , "One - kitchen cabinet" , "Single item, maybe part of a set" .)

I've seen this clue in The Telegraph.

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