Crossword Genius

Fairy tale opener (4)

Ross

I believe the answer is:

once

'fairy tale opener' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for once that I've seen before include "Previously" , "Cone (anag.)" , "One-time - one time" , "in days of yore?" , "Singly" .)

I've seen this clue in the Universal and The Wall Street Journal.
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