Down with legal document constraining journalists! (9)
I believe the answer is:
depressed
'down' is the definition.
(I know that down can be written as depressed)
'legal document constraining journalists' is the wordplay.
'legal document' becomes 'deed' (deed is a kind of legal document).
'constraining' indicates putting letters inside.
'journalists' becomes 'press' (the press can mean the newspaper industry).
'deed' going around 'press' is 'DEPRESSED'.
'with' acts as a link.
(Other definitions for depressed that I've seen before include "Unhappy, despondent" , "Flattened downward" , "dispirited" , "Poverty-stricken" , "Sad or indented" .)