Informed in a note about conflict (5)
I believe the answer is:
aware
'informed' is the definition.
(I've seen this before)
'a note about conflict' is the wordplay.
'note' becomes 'e' (musical note).
'about' is a charade indicator (letters next to each other).
'conflict' becomes 'war' (war is a kind of conflict).
'e' put after 'war' is 'ware'.
'a'+'ware'='AWARE'
'in' acts as a link.
(Other definitions for aware that I've seen before include "Bearing in mind" , "Acquainted with or conscious of" , "well informed" , "Alert, conscious of" , "Having knowledge (of fact)" .)