A share in the plot (9)
I believe the answer is:
allotment
This clue is a double definition.
'a share' is the first definition.
(allotment is a kind of share)
'the plot' is the second definition.
(I've seen this before)
'in' acts as a link.
(Other definitions for allotment that I've seen before include "Where vegetables may be produced" , "Share - small piece of land rented for cultivation" , "Plot of public land rented to an individual for gardening" , "cultivated area" , "Rented piece of ground" .)