Charlie drawing vehicle that needs to be drawn? (4)
I believe the answer is:
cart
'vehicle that needs to be drawn?' is the definition.
(eg a horse-drawn cart)
'charlie drawing' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'drawing' becomes 'art' (drawing is an art).
'c'+'art'='CART'
(Other definitions for cart that I've seen before include "Pulled vehicle" , "Don't put this before the horse (4)" , "Something not to be put in front of the horse" , "Light vehicle" , "Old two-wheeled goods vehicle" .)