Nearly everybody carrying weapons is scared (7)
I believe the answer is:
alarmed
'is scared' is the definition.
(I've seen this in another clue)
'nearly everybody carrying weapons' is the wordplay.
'nearly' means to remove the last letter.
'everybody' becomes 'all' (I've seen this before).
'carrying weapons' becomes 'armed' (someone carrying a weapon is armed).
'all' with its last letter taken off is 'al'.
'al'+'armed'='ALARMED'
(Other definitions for alarmed that I've seen before include "In a panic" , "Fearful" , "Worried" , "Terrified" , "Frightened, disturbed" .)