Crossword Genius

Decreed a raid should be carried out by, one day (8)

Ross

I believe the answer is:

ordained

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'decreed' is the definition.
(I know that decreed can be written as ordained)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ordained that I've seen before include "Decreed, or appointed to priesthood" , "Laid down the law" , "Conferred holy orders on" , "Like a priest" , "Elevated to the priesthood" .)

I've seen this clue in the Evening Standard.
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