Crossword Genius

A shroud, we hear, to cause dismay (5)

Ross

I believe the answer is:

appal

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'dismay' is the definition.
(I know that dismay can be written as appal)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for appal that I've seen before include "To shock, dismay" , "Put at rest (suspicion)" , "Shock, horrify" , "Cause to be unpleasantly surprised" , "expressed dismay" .)

I've seen this clue in The Irish News.
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