Just a rotation in a crop (6)

I believe the answer is:

barely

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'just' is the definition.
(synonyms)

I don't understand the rest of the clue.

(Other definitions for barely that I've seen before include "how babies are born?" , "Hardly" , "how naturists exist" , "how streakers like to act?" , "just a short while before" .)

I've seen this clue in The Guardian.

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