Grassland has an arrangement to include vehicle (8)
I believe the answer is:
savannah
'grassland' is the definition.
(savannah is a kind of grassland)
'has an arrangement to include vehicle' is the wordplay.
'arrangement' indicates an anagram.
'to include' means one lot of letters goes inside another.
'vehicle' becomes 'van' (van is a kind of vehicle).
'has'+'an'='hasan'
'hasan' with letters rearranged gives 'sanah'.
'sanah' placed around 'van' is 'SAVANNAH'.
(Other definitions for savannah that I've seen before include "US port" , "Georgia city; grassy plain" , "Flat grassland in hot regions" , "Flat grassland in tropical or subtropical regions" , "A grassy plain in hot regions with no trees" .)