Allotment scheme? (4)
I believe the answer is:
plot
I believe this clue is a double definition.
'allotment' is the first definition.
(thesaurus)
'scheme?' is the second definition.
(plot is a kind of scheme)
(Other definitions for plot that I've seen before include "Scheme or small piece of land" , "garden area" , "Scheme, story and piece of ground" , "Novel story - secret plan" , "Design" .)