Tea display vehicle (7)
I believe the answer is:
chariot
'vehicle' is the definition.
(I know that chariot is a vehicle)
'tea display' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'display' becomes 'riot' (I have seen 'Lavish display' mean 'riot' so perhaps 'display' could also mean 'riot').
'cha'+'riot'='CHARIOT'
(Other definitions for chariot that I've seen before include "Ancient horse-drawn war vehicle" , "Ben Hur transport?" , "Horse-drawn racing vehicle; oat rich (anag.)" , "Two-wheeled carriage of ancient times, as used by Ben Hur" , "ceremonial carriage" .)