Crossword Genius

Payment promise (3)

Ross

I believe the answer is:

iou

(Other definitions for iou that I've seen before include "Creditor's note" , "Debt note (abbr.)" , "Promise to pay in vowels" , "Debtor's note" , "Proof of debt" .)

I've seen this clue in the USA Today, the Universal and The Wall Street Journal.
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