How farmer could make money for English plant (10)

I believe the answer is:

sellafield

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'how farmer could make money' is the definition.
(a farmer might sell a field)

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

(Other definitions for sellafield that I've seen before include "in Cumbria" , "Cumbrian nuclear site" .)

I've seen this clue in The Times.

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