Tricks to grab open country in legal documents (9)

I believe the answer is:

contracts

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'legal documents' is the definition.
(contract is a kind of legal document)

'tricks to grab open country' is the wordplay.
'tricks' becomes 'cons' (trick can mean to scam or con).
'to grab' indicates putting letters inside.
'open country' becomes 'tract' (I can't justify this - if you can you should believe this answer much more).
'cons' enclosing 'tract' is 'CONTRACTS'.

'in' is the link.

Can you help me to learn more?

(Another definition for contracts that I've seen is " Legal agreements".)

I've seen this clue in The Times.

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