Revise writing (4)
I believe the answer is:
edit
'revise writing' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for edit that I've seen before include "Prepare text for publication" , "This is an act of cleaning" , "Prepare (material) for publishing" , "Prepare (material) for publication" , "Tide (anag.)" .)