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 Penny Press, the Newsday, The New York Times, the Universal, the Newsday.com, the Wall Street Journal, the LA Times, the King Feature Syndicate and the USA Today.

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