A single time (4)

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

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