Added comments from working at Eton and outside (9)
I believe the answer is:
annotated
'added comments' is the definition.
'working at eton and outside' is the wordplay.
'working' indicates an anagram.
'outside' is an insertion indicator.
'at'+'eton'='ateton'
'ateton' with letters rearranged gives 'notate'.
'notate' put inside 'and' is 'ANNOTATED'.
'from' acts as a link.
(Other definitions for annotated that I've seen before include "written all over?" , "explained" , "Added comments to" .)