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 quite see how this works, but
'urge' could be 'press' (synonyms) and 'press' is located in the answer.
'action' could be 'deed' (deed is a kind of action) and 'deed' is present in the remaining letters.
No letters remain.
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" .)