Crossword Genius

Best policy for decreasing the prison population (7)

Ross

I believe the answer is:

honesty

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'best policy' is the definition.
(I've seen this in another clue)

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

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(Other definitions for honesty that I've seen before include "Fairness" , "Straightforwardness" , "A virtue" , "Plant; truthfulness" , "Uprightness" .)

I've seen this clue in the Evening Standard.
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