Removed a timeline, changing day (10)
I believe the answer is:
eliminated
'removed' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Maybe you can see a link between them that I can't see?
'a timeline changing day' is the wordplay.
'changing' indicates an anagram.
'day' becomes 'd' (abbreviation for day).
'a'+'timeline'='atimeline'
'atimeline' is an anagram of 'eliminate'.
'eliminate'+'d'='ELIMINATED'
Can you help me to learn more?
(Another definition for eliminated that I've seen is " Cancelled".)