Crossword Genius

It's taken very seriously (4)

Ross

I believe the answer is:

oath

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If this is the answer I cannot explain how the clue works.

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(Other definitions for oath that I've seen before include "Swear word" , "Sworn promise" , "A curse or solemn declaration" , "Profane or obscene expression" , "Commitment to tell the truth" .)

I've seen this clue in the Evening Standard.
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