Arrange peace after lab site vandalised (9)
I believe the answer is:
establish
'arrange' is the definition.
The answer and definition can be both related to thinking as well as being verbs in their base form.
Perhaps you can see a link between them that I can't see?
'peace after lab site vandalised' is the wordplay.
'peace' becomes 'sh' (I am not sure about this - if you are sure you should believe this answer much more).
'after' is a charade indicator (letters next to each other).
'vandalised' indicates an anagram.
'lab'+'site'='labsite'
'labsite' with letters rearranged gives 'establi'.
'sh' after 'establi' is 'ESTABLISH'.
Can you help me to learn more?
(Other definitions for establish that I've seen before include "Set up or bring into existence" , "Found or authenticate" , "Institute; set up" , "Create - lodge" , "form" .)