Mark joins him in the country (3)

I believe the answer is:

den

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'him in the country' is the definition.
'Den' can be an answer for 'him'. I'm not sure about the 'in the country' bit.

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

Can you help me to learn more?

(Other definitions for den that I've seen before include "Private office" , "Animal habitation" , "Cave" , "Lair for animal or study for gent" , "Room for work or play" .)

I've seen this clue in the Evening Standard.

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