Reversal of current change (4)
I believe the answer is:
edit
'change' is the definition.
(editing is a kind of changing)
'reversal of current' is the wordplay.
'reversal of' says the letters should be written in reverse.
'current' becomes 'tide' (I've seen this before).
'tide' reversed gives 'EDIT'.
(Other definitions for edit that I've seen before include "Prepare text for press" , "Be in charge of (newspaper)" , "Emend" , "modify text" , "Revise text" .)