Dismays (6)
I believe the answer is:
appals
'dismays' is the definition.
('appal' can be a synonym of 'dismay')
This is the entire clue.
(Other definitions for appals that I've seen before include "Fills with disgust" , "Shocks" , "'Horrifies, outrages (6)'" , "Fills with dismay or horror (6)" .)