Produces, scrubs, crops as expected (3)

I believe the answer is:

due

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

I cannot understand how the rest of the clue works.

(Other definitions for due that I've seen before include "Ripe for payment or arrival" , "Required; proper" , "Outstanding" , "Owing, unpaid" , "Appropriate - fee - requiring payment" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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