Drink leading to disturbance in vehicle (7)
I believe the answer is:
chariot
'vehicle' is the definition.
(I know that chariot is a vehicle)
'drink leading to disturbance' is the wordplay.
'drink' becomes 'cha' (cha can mean tea).
'leading to' is a charade indicator (letters next to each other) (some letters go before or lead others).
'disturbance' becomes 'riot' (I've seen this before).
'cha'+'riot'='CHARIOT'
'in' is the link.
(Other definitions for chariot that I've seen before include "Old vehicle (of fire?)" , "ride in carriage" , "Vehicle in Ben Hur?" , "Ancient horse-drawn war vehicle" , "Roman two-wheeled vehicle" .)