Extreme fear (6)

I think it could be either:

terror

horror

'extreme fear' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for horror that I've seen before include "Extreme shock and fright" , "Intense shock" , "Extreme fear or revulsion" , "'Repugnance, revulsion (6)'" , "Feeling of loathing and fear" .)

I've seen this clue in the King Feature Syndicate, The Independent, The Irish Times, The Times, The Mirror, the USA Today, the Newsday, the Universal and the Evening Standard.

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