Unhappy, urge to take action about (9)
I believe the answer is:
depressed
'unhappy' is the definition.
(thesaurus)
'urge to take action about' is the wordplay.
I cannot really see how this works, but
'urge' could be 'press' (synonyms) and 'press' is present in the answer.
'action' could be 'deed' (deed is a kind of action) and 'deed' is found within the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for depressed that I've seen before include "showing the blues" , "Flattened downward" , "Poverty-stricken" , "Unhappy, despondent" , "Indented or melancholy" .)