One of six in charge of our land, one a so-called farmer (6)

I believe the answer is:

george

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'so-called farmer' is the definition.
(George III was nicknamed Farmer George)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for george that I've seen before include "England's patron saint" , "-- Michael; -- Formby" , "Man rowing on holiday" , "Name of six British kings" , "Ira's composer brother" .)

I've seen this clue in The Guardian.

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