In the field of agriculture, one gathers (6)

I believe the answer is:

reaper

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

I can't explain the remainder of the clue.

(Other definitions for reaper that I've seen before include "Wordsworth's was Solitary" , "One who cuts grain as harvest" , "Farm worker" , "Harvester of, eg, 4 dn" , "Farm machinery" .)

I've seen this clue in the Evening Standard.

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