Our timely version (4)

I believe the answer is:

hour

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'version' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for hour that I've seen before include "(Period of) time" , "Sixty minutes" , "Length of time" , "Time within day" , "Three thousand and six hundred seconds" .)

I've seen this clue in the Evening Standard.

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