Cares about shock (5)
I believe the answer is:
scare
'shock' is the definition.
(I know that alarm is a is a more specific form of the action of shock)
'cares about' is the wordplay.
'about' indicates anagramming the letters.
'cares' is an anagram of 'SCARE'.
(Other definitions for scare that I've seen before include "Startle" , "Cause fright, alarm" , "Panic" , "Frighten or intimidate" , "Health worry" .)