Crossword Genius

Serious promise (4)

Ross

I believe the answer is:

oath

(Other definitions for oath that I've seen before include "Solemn promise to tell the truth or be loyal" , "Curse or solemn word" , "Profane or obscene expression" , "Courtroom promise" , "Swear word" .)

I've seen this clue in the USA Today.
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