Cart (4)
'cart' is the definition.
(a cart without sides for delivering heavy loads)
This is the entire clue.
(Other definitions for dray that I've seen before include "Squirrel's home" , "Cart for carrying heavy goods" , "Draught horse" , "Delivery cart" , "Strong low cart for heavy loads" .)
'cart' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for wagon that I've seen before include "On this, one keeps dry!" , "Cart; rail truck" , "Transport" , "Wild West trail vehicle?" , "Vehicle carrying goods" .)