Blue printing activities in action (9)
I believe the answer is:
depressed
'blue' is the definition.
(I know that blue can be written as depressed)
'printing activities in action' is the wordplay.
'printing activities' becomes 'press' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'action' becomes 'deed' (deed is a kind of action).
'press' placed into 'deed' is 'DEPRESSED'.
Can you help me to learn more?
(Other definitions for depressed that I've seen before include "Having been pushed down" , "Unhappy, despondent" , "Poverty-stricken" , "Indented or melancholy" , "Downhearted" .)