Outdoor revival of Pinafore fellow's skipped (4-3)

I believe the answer is:

open air

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'outdoor' is the definition.
(outdoor means out in the open air)

I don't understand the rest of the clue.

(Other definitions for open air that I've seen before include "Outdoors - with no cover" , "Outdoor" , "kind of concert" , "in the country?" , "Outside" .)

I've seen this clue in The Everyman puzzle in The Observer.

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