Sudden terror (5)

I think it could be either:

alarm

panic

'sudden terror' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for panic that I've seen before include "Losing one's head" , "Great consternation" , "Contagious fear" , "Frenzy" , "Grass" .)

I've seen this clue in The Mirror.

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