Crossword Genius

To be bound in duty or moral obligation (5)

Ross

I believe the answer is:

ought

(Other definitions for ought that I've seen before include "Anything at all (archaic)" , "outdated anything at all?" , "Has a duty (to do something)" , "It expresses duty or obligation" , "Have/has a duty (to do)" .)

I've seen this clue in the Sydney Morning Herald.
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