Crossword Genius

It's a crime to lie under it (4)

Ross

I believe the answer is:

oath

(Other definitions for oath that I've seen before include "Swearword or solemn word" , "darn, for example" , "Courtroom promise" , "gadzooks!" , "Curse or solemn word" .)

I've seen this clue in the New York Times.
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