Panic that wakes you up (5)
I believe the answer is:
alarm
'panic' is the definition.
(alarm can mean panic or fear)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for alarm that I've seen before include "Anxious awareness of danger" , "Frighten or startle" , "A rousing sound in the morning" , "Wake-up call?" , "Safety bell or alert signal" .)