It's all over! (4-2-4)

I believe the answer is:

wall-to-wall

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'over' is the definition.
Both the answer and definition are adjectives.
Perhaps there's an association between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for wall-to-wall that I've seen before include "(Of carpet) fitted" , "Widespread" .)

I've seen this clue in The Telegraph.

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