It sounds completely sacred (4)

I believe the answer is:

holy

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'sacred' is the definition.
(similar in meaning)

I don't understand the rest of the clue.

(Other definitions for holy that I've seen before include "Sanctified" , "Sacred" , "Divine" , "Devout" , "Charlemagne was the first" .)

I've seen this clue in The Globe and Mail.

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