Crossword Genius

Terror that wakes you up (5)

Ross

I believe the answer is:

alarm

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'terror' is the definition.
(thesaurus)

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(Other definitions for alarm that I've seen before include "Scare with warning device" , "Agitate" , "Great concern" , "Safety bell or alert signal" , "Worried perhaps if one rings" .)

I've seen this clue in The Mirror.
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