Crossword Genius

Earl will not participate in adultery, due to moral obligation (4)

Ross

I believe the answer is:

duty

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'moral obligation' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for duty that I've seen before include "Allegiance" , "Obligatory task(s) - tax" , "Tariff" , "Tax - burden" , "Is one bound" .)

I've seen this clue in The Irish Times.
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