Document that has to do with land (8)
I believe the answer is:
contract
'document' is the definition.
(I know that contract is a type of written agreement)
'to do with land' is the wordplay.
'to do' becomes 'con' (both can mean to defraud).
'with' means one lot of letters go next to another.
'land' becomes 'tract' (I've seen this in other clues).
'con'+'tract'='CONTRACT'
'that has' is the link.
(Other definitions for contract that I've seen before include "Document setting out terms of agreement" , "Undertake" , "Binding agreement between two or more" , "Shrink in legal agreement?" , "Come down with" .)