Changes order of tides (5)
I believe the answer is:
edits
'changes' is the definition.
(editing is a kind of changing)
'order of tides' is the wordplay.
'order of' indicates an anagram.
'tides' is an anagram of 'EDITS'.
(Other definitions for edits that I've seen before include "Redacts" , "Alters (text)" , "Revises" , "Directs newspaper production" , "Modifies" .)