Wrapping weight (4)
I believe the answer is:
tare
'wrapping weight' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tare that I've seen before include "Vessel's weight" , "Moved very quickly" , "Weight of container makes a vetch" , "Vehicle weight minus fuel and load" , "Weedy annual grass, often occurs in grainfields" .)