Crossword Genius

A single time (4)

Ross

I believe the answer is:

once

'a single time' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for once that I've seen before include "A single time" , "Just as a single occurrence" , "Some time back" , "One-time musical film and song" , "in bygone era" .)

I've seen this clue in the King Feature Syndicate, The New York Times, the Newsday, the Penny Press, the USA Today, the LA Times, the Universal, The Washington Post, The Mirror, the Sydney Morning Herald and The Telegraph.
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