Crossword Genius

Horrify a namesake of Revere when speaking (5)

Ross

I believe the answer is:

appal

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

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

(Other definitions for appal that I've seen before include "Dismay, horrify" , "Outrage" , "Greatly dismay" , "Put at rest (suspicion)" , "expressed dismay" .)

I've seen this clue in The Times.
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