Crossword Genius

The "O" in IOU (3)

Ross

I believe the answer is:

owe

'the o in iou' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for owe that I've seen before include "Have obligation to pay" , "Have a debt to (someone)" , "Be in the red" , "Have outstanding" , "have favours to return" .)

I've seen this clue in the Universal and the USA Today.
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