Predicted violent war with foes (7)
I believe the answer is:
foresaw
'predicted' is the definition.
(I've seen this before)
'violent war with foes' is the wordplay.
'violent' indicates an anagram.
'with' is a charade indicator (letters next to each other).
'war' put after 'foes' is 'foeswar'.
'foeswar' with letters rearranged gives 'FORESAW'.
(Other definitions for foresaw that I've seen before include "Predicted" , "Expected" , "Anticipated" .)