Terrifying, spine-chilling (13)

I believe the answer is:

bloodcurdling

This clue is a double definition.

'terrifying' is the first definition.
(thesaurus)

'spine-chilling' is the second definition.
(I've seen this before)

(Other definitions for bloodcurdling that I've seen before include "Scary" , "Horrific" , "Causing horror" , "Horrible (of a scream?)" , "Terrifying (threats)" .)

I've seen this clue in The Times.

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