Crossword Genius

Altar promise (3)

Ross

I believe the answer is:

ido

(Other definitions for ido that I've seen before include "Say yes in marriage" , "Required affirmative in wedding ceremony" , "Words made up" , "International language" , "Artificial language" .)

I've seen this clue in the King Feature Syndicate, The New York Times and The Wall Street Journal.
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