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 tell whether this defines the answer.
'cheats seizing a piece of land' is the wordplay.
'cheats' becomes 'cons' (conning is a kind of cheating).
'seizing' is an insertion indicator (inserted letters are seized).
'a piece of land' becomes 'tract' (tract can mean an area 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".)