Laundry batch (4)
I believe the answer is:
load
'laundry batch' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for load that I've seen before include "that's put on commercial vehicle" , "Charge a gun" , "Goods carried by a large vehicle" , "A heavy burden" , "Weigh down" .)