Unhappy journalists participating in action (9)
I believe the answer is:
depressed
'unhappy' is the definition.
(thesaurus)
'journalists participating in action' is the wordplay.
'journalists' becomes 'press' (the press can mean the newspaper industry).
'participating in' is an insertion indicator.
'action' becomes 'deed' (deed is a kind of action).
'press' going within 'deed' is 'DEPRESSED'.
(Other definitions for depressed that I've seen before include "Flattened downward" , "25 [BLUE]" , "Sad or indented" , "Indented or melancholy" , "Having been pushed down" .)