Be indebted to (3)

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 Irish Times, the Penny Press, The Guardian, The Mirror, The Telegraph, The Sun, the Universal, the Evening Standard and the Newsday.

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