The part of plough, perhaps? (5)

I believe the answer is:

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'the part' is the definition.
('share' can be a synonym of 'part')

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

(Other definitions for share that I've seen before include "Division" , "Have part-ownership" , "Portion, allotment" , "Cutting blade" , "Portion; plough blade" .)

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