Crossword Genius

Debtor's letters (3)

Ross

I believe the answer is:

iou

(Other definitions for iou that I've seen before include "Debt note (abbr.)" , "Note acknowledging debt" , "Chit acknowledging debt" , "Promise to pay in vowels" , "Promissory note" .)

I've seen this clue in the Penny Press, the Universal and the King Feature Syndicate.
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