Prepare for the turn of the tide (4)
I believe the answer is:
edit
'prepare' is the definition.
(thesaurus)
'the turn of the tide' is the wordplay.
'the turn of' says the letters should be written in reverse (I've seen 'turned' mean this).
'tide' reversed gives 'EDIT'.
'for' is the link.
(Other definitions for edit that I've seen before include "Literally, arrange" , "Make changes to (text)" , "Alter text" , "Emend" , "work on newspaper?" .)