A single time (4)

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

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