Crossword Genius

Dumbfounded that there was no sermon (10)

Ross

I believe the answer is:

speechless

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'dumbfounded' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for speechless that I've seen before include "In shock" , "Lost for words" , "Struck dumb" , "Dumbfounded" , "being forced to improvise?" .)

I've seen this clue in The Irish Times.
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