Golden Rule word (4)

I think it could be either:

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unto

'golden rule word' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for unto that I've seen before include "'The Lord said . . . . Moses'" , "Biblical preposition, the archaic 'to'" , "'Do ... others, etc.'" , "'''For ... us a child is born'' (Handel's Messiah) (4)'" , "Heading for" .)

I've seen this clue in the LA Times, the King Feature Syndicate, the Newsday.com, the Newsday, The New York Times, the Universal, the USA Today, the Penny Press and the Wall Street Journal.

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