Personal writing, including edition that's strategically misleading (12)
I believe the answer is:
diversionary
'strategically misleading' is the definition.
I can't judge whether this definition defines the answer.
'personal writing including edition' is the wordplay.
'personal writing' becomes 'diary' (diary is a kind of writing. I am not sure about the 'personal' bit.).
'including' is an insertion indicator.
'edition' becomes 'version'.
'diary' going around 'version' is 'DIVERSIONARY'.
'that's' is the link.
Can you help me to learn more?
(Other definitions for diversionary that I've seen before include "is distracting" , "Intended to distract attention" , "draw attention away from what matters" , "forcing a track change" .)