Part of a plough no single person can own? (5)

I believe the answer is:

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'part' is the definition.
(I know that part can be written as share)

I can't explain the rest of the clue.

(Other definitions for share that I've seen before include "hand pieces out" , "Allotted portion" , "Have part-ownership" , "Part, portion" , "Portion; plough blade" .)

I've seen this clue in The Irish News.

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