Heavy cart (4)
I believe the answer is:
dray
'heavy cart' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dray that I've seen before include "Nest in tree" , "Cart without sides, for delivering barrels" , "Cart for carrying heavy goods" , "Cart used for heavy loads" , "Heavy load-carrying vehicle" .)