Owing money, one might say for sport (4)

I believe the answer is:

judo

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'for sport' is the definition.
(judo is a kind of sport)

I can't explain the remainder of the clue.

(Other definitions for judo that I've seen before include "Contact sport" , "Self-defence discipline" , "Throwing sport (from the Japanese for gentleness)" , "Unarmed combat sport" , "event" .)

I've seen this clue in The Times.

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