Crossword Genius

Agrarian epoch crops twice in rotation outside (4-3)

Ross

I believe the answer is:

open air

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'outside' is the definition.
(open air is a kind of outside)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for open air that I've seen before include "not doing covers?" , "kind of concert" , "Outdoors - with no cover" , "like 12 [CONCERT] in Hyde Park" , "Unenclosed space outdoors" .)

I've seen this clue in The Telegraph.
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