Want special vehicle to visit Hull, for one (8)
I believe the answer is:
scarcity
'want' is the definition.
(I've seen this before)
'special vehicle to visit hull for one' is the wordplay.
'special' becomes 'S' (common abbreviation as in Special Air Service).
'vehicle' becomes 'car' (car is a kind of vehicle).
'to visit' is a charade indicator (letters next to each other).
'hull for one' becomes 'city' (hull is a kind of city).
's'+'car'+'city'='SCARCITY'
(Other definitions for scarcity that I've seen before include "Something uncommon" , "Want" , "Thinness" , "Poverty" , "Lack - dearth" .)