Crossword Genius

Promise of payment (3)

Ross

I believe the answer is:

iou

(Other definitions for iou that I've seen before include "I owe you" , "Promise to pay in vowels" , "Admission of liability" , "Debt acknowledgment" , "Note acknowledging debt" .)

I've seen this clue in the USA Today, the Newsday.com and the New York Times.
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