Summarisation leads to mission in distress (6)
I believe the answer is:
trauma
'distress' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for trauma that I've seen before include "Wounding shock" , "Psychological wound" , "dreadful shock!" , "Physical or mental shock" , "Lasting shock or disturbance" .)