A virtue easily cultivated (7)

I believe the answer is:

honesty

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'a virtue' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for honesty that I've seen before include "Plant; sincerity" , "Fairness" , "that's easily cultivated" , "Integrity" , "truth" .)

I've seen this clue in The Globe and Mail.

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