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 found within the answer.
'action' could be 'deed' (deed is a kind of action) and 'deed' is located in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
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" .)