Snap after receiving a new scare (5)
I believe the answer is:
panic
'scare' is the definition.
(I know that panic is a kind of terrify)
'snap after receiving a new' is the wordplay.
'snap' becomes 'pic' (short for picture).
'after receiving' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'a'+'n'='an'
'pic' enclosing 'an' is 'PANIC'.
(Other definitions for panic that I've seen before include "Sudden overpowering anxiety" , "mass hysteria?" , "Fear out of sixteen ac" , "Sudden infectious terror" , "Lose the head, yield to fear" .)