The farmer's creditable work (4)

I believe the answer is:

crop

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'work' is the definition.
(synonyms)

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

(Other definitions for crop that I've seen before include "Plant grown commercially" , "Set" , "Short cut - taken when hunting?" , "The yield, from cereals say" , "Reduce" .)

I've seen this clue in the Evening Standard.

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