Crossword Genius

Group own all but the last two (5)

Ross

I believe the answer is:

posse

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'group' is the definition.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for posse that I've seen before include "power" , "Body of constables" , "Sheriff's party" , "Group temporarily established for some purpose" , "legal team" .)

I've seen this clue in The Telegraph.
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