Vehicle causes disturbance after tea (7)
I believe the answer is:
chariot
'vehicle' is the definition.
(I know that chariot is a type of military vehicle)
'disturbance after tea' is the wordplay.
'disturbance' becomes 'riot' (I've seen this in another clue).
'after' means one lot of letters go next to another.
'tea' becomes 'cha' (cha is a type of tea).
'riot' put after 'cha' is 'CHARIOT'.
'causes' is the link.
(Other definitions for chariot that I've seen before include "ride in carriage" , "four-wheeled carriage?" , "Ancient horse-drawn war vehicle" , "Stately vehicle" , "ceremonial carriage" .)