Version in which stream flows west (4)
I believe the answer is:
edit
'version in' is the definition.
The answer and definition are not the same part of speech.
'stream flows west' is the wordplay.
'stream' becomes 'tide'.
'flows west' says the letters should be written backwards (I've seen 'flowing west' mean this (written from right to left or 'east to west')).
'tide' reversed gives 'EDIT'.
'which' acts as a link.
Can you help me to learn more?
(Other definitions for edit that I've seen before include "Blue-pencil" , "Redact, perhaps" , "Check text for publication" , "Adjust text" , "Prepare text for publication" .)