Sudden upsetting or surprising events (6)
I believe the answer is:
shocks
'sudden upsetting or surprising events' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for shocks that I've seen before include "Sudden upsetting or surprising events" , "Surprises, sometimes electrical" , "Jolts, jars" , "Effects of charges of electricity" , "Appals" .)