Crossword Genius

Be indebted to (3)

Ross

I think it could be either:

ore

owe

(Other definitions for ore that I've seen before include "Mineral deposit" , "Naturally occurring mineral" , "not worth a lot to Danes" , "Raw material" , "Unwrought iron" .)

I've seen this clue in The Telegraph, The New York Times, the Evening Standard, The Irish Times, the Newsday, the Universal, The Mirror, the Penny Press, The Sun and The Guardian.
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