Alarm; phobia (4)
I believe the answer is:
fear
I believe this is a double definition.
'alarm' is the first definition.
(I've seen this in another clue)
'phobia' is the second definition.
(I've seen this in another clue)
(Other definitions for fear that I've seen before include "Terror" , "Dread, great anxiety" , "Qualms" , "Consternation" , "Anxiety caused by danger" .)