Just a single time (4)

I believe the answer is:

once

'just 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 "Formerly; as soon as" , "Singly" , "Cone (anag.)" , "At some time past" , "At some former time" .)

I've seen this clue in the Universal, the USA Today, the Newsday, The Mirror, the Wall Street Journal and the Newsday.com.

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