Separate, as laundry (4)
I believe the answer is:
sort
'separate as laundry' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sort that I've seen before include "Shuffle into desired sequence" , "The kind to categorise" , "Work out" , "Arrange systematically" , "Type - arrange in groups" .)