Disturbed - nearly everybody prepared for war (7)
I believe the answer is:
alarmed
'disturbed' is the definition.
(I've seen this in another clue)
'nearly everybody prepared for war' is the wordplay.
'nearly' means to remove the last letter.
'everybody' becomes 'all' (I've seen this before).
'prepared for war' becomes 'armed' (I've seen this in another clue).
'all' with its last letter taken away is 'al'.
'al'+'armed'='ALARMED'
(Other definitions for alarmed that I've seen before include "Worried" , "Anxious; disturb" , "as a door handle may be?" , "Terrified" , "Flapping" .)