Terror I see after attack (5)
I believe the answer is:
panic
'terror' is the definition.
(I know that terror can be written as panic)
'i see after attack' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'after' is a charade indicator (letters next to each other).
'attack' becomes 'pan' (pan can mean to attack or criticise).
'i'+'c'='ic'
'ic' put after 'pan' is 'PANIC'.
(Other definitions for panic that I've seen before include "displaying great fear" , "Alarm, scare" , "Go to pieces" , "Horror" , "much unease" .)