Some new arrangements for battle? (3)
I believe the answer is:
war
'battle?' is the definition.
(I've seen this in other clues)
'some new arrangements for' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'WAR' is hidden in the letters of 'new arrangements for'.
(Other definitions for war that I've seen before include "Large-scale conflict" , "State of armed struggle" , "Major conflict" , "Sustained conflict" , "State of armed conflict" .)