Plot of land given to tall men, possibly (9)
I believe the answer is:
allotment
'plot of land' is the definition.
(I've seen this before)
'to tall men possibly' is the wordplay.
'possibly' is an anagram indicator.
'to'+'tall'+'men'='totallmen'
'totallmen' is an anagram of 'ALLOTMENT'.
'given' acts as a link.
(Other definitions for allotment that I've seen before include "Portion, distribution" , "Rented piece of ground" , "growing area?" , "cultivated area" , "Plot for cultivation" .)