Vehicle runs into pussy (4)
I believe the answer is:
cart
'vehicle' is the definition.
(cart is a kind of vehicle)
'runs into pussy' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'into' means one lot of letters goes inside another.
'pussy' becomes 'cat' (I've seen this before).
'r' placed inside 'cat' is 'CART'.
(Other definitions for cart that I've seen before include "Carry with effort" , "Don't put this before the horse (4)" , "Open vehicle" , "Light vehicle" , "Two-wheeled open wagon" .)