Crossword Genius

Fill with horror (5)

Ross

I believe the answer is:

appal

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

This is all the clue.

(Other definitions for appal that I've seen before include "exhibiting dismay" , "To shock, dismay" , "Cause to be unpleasantly surprised" , "Greatly dismay" , "Scandalise" .)

I've seen this clue in The Guardian and The Mirror.
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