About again (4)

I believe the answer is:

over

I believe this is a double definition.

'about' is the first definition.
(I've seen this before)

'again' is the second definition.
(as in the phrases 'start over' and 'start again')

(Other definitions for over that I've seen before include "See 12" , "Finished, concluded" , "settled" , "Ancient history" , "Higher than; finished" .)

I've seen this clue in The Telegraph.

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