See art as a vehicle (4)
I believe the answer is:
cart
'a vehicle' is the definition.
(cart is a kind of vehicle)
'see art' is the wordplay.
'see' becomes 'c' (the word for the letter, according to Chambers).
'c'+'art'='CART'
'as' is the link.
(Other definitions for cart that I've seen before include "Farm vehicle" , "Don't put this before the horse (4)" , "Something not to be put in front of the horse" , "Carrying vehicle" , "Open wagon (to come after, not before, the horse)" .)