Fairy-tale word after "once"

This crossword clue is for the definition: Fairy-tale word after "once".
it’s A 38 letters crossword puzzle definition.
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Possible Answers: UPON.

Last seen on: Universal Crossword – Oct 13 2020

Random information on the term “UPON”:

Francis Gurry (born 17 May 1951) is an Australian national, who was from 2008 to 2020 the fourth Director General of the World Intellectual Property Organization (WIPO). During that time, he was also Secretary-General of the International Union for the Protection of New Varieties of Plants (UPOV). Gurry also served as a Deputy Director General of WIPO from 2003 to 2008.

Gurry graduated in 1974 from the University of Melbourne with a Bachelor of Laws and was admitted as a barrister and solicitor of the Supreme Court of Victoria, Australia in 1975. He worked in Melbourne as an articled clerk and solicitor at Arthur Robinson & Co. (now Allens) and earned a Master of Laws degree from the University of Melbourne in 1976. From 1976 to 1979, Gurry was a research student at the Faculty of Law at the University of Cambridge, United Kingdom, from which he was awarded a PhD in 1980 for his thesis dealing with breach of confidence.

UPON on Wikipedia