Military conflict or struggle (7)
I believe the answer is:
warfare
I believe this clue is a double definition.
'military conflict' is the first definition.
(I've seen this in another clue)
'struggle' is the second definition.
(I know that warfare is a type of struggle)
(Other definitions for warfare that I've seen before include "action" , "Armed conflict" , "All-out fighting" , "Strife" , "Campaigning" .)