With the agreements cheats, seizing a piece of land (9)
I believe the answer is:
contracts
'with the agreements cheats seizing a piece of land' is the definition.
I can't judge whether this defines the answer.
'cheats seizing a piece of land' is the wordplay.
'cheats' becomes 'cons' (con is a kind of cheat).
'seizing' is an insertion indicator.
'a piece of land' becomes 'tract' ('tract' can be a synonym of 'piece of land').
'cons' going around 'tract' is 'CONTRACTS'.
Can you help me to learn more?
(Another definition for contracts that I've seen is " Legal agreements".)