Crossword Genius

React in horror (4)

Ross

I believe the answer is:

gasp

'react in horror' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for gasp that I've seen before include "Sudden intake of breath" , "Noisily breathe" , "Have trouble breathing" , "Sound of astonishment" , "Pant" .)

I've seen this clue in the King Feature Syndicate.
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