Men on stretch of land in vehicle (7)
I believe the answer is:
tractor
'vehicle' is the definition.
(I know that tractor is a type of off-road vehicle)
'men on stretch of land' is the wordplay.
'men' becomes 'OR' (military abbreviation for Other Ranks).
'on' says to put letters next to each other.
'stretch of land' becomes 'tract' (I've seen this before).
'or' put after 'tract' is 'TRACTOR'.
'in' is the link.
(Other definitions for tractor that I've seen before include "Tower" , "Farming vehicle" , "Vehicle used for hauling heavy loads" , "Farm machine used for pulling" , "Agricultural machine" .)