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

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