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

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