Batch of laundry (4)
I believe the answer is:
load
'batch of laundry' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for load that I've seen before include "A heavy burden" , "Weight, source of pressure" , "Weigh down" , "Goods carried by a large vehicle" , "Charge a gun" .)