Crossword Genius

A single time (4)

Ross

I believe the answer is:

once

'a single time' is the definition.
(I've seen this before)

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 Telegraph, the USA Today, The New York Times, the Sydney Morning Herald, the LA Times, The Washington Post, the Penny Press, the Universal, the King Feature Syndicate, The Mirror and the Newsday.
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