Panic just being stuck in bog (8)
I believe the answer is:
frighten
'panic' is the definition.
(I know that panic is a more specific form of terrify)
'just being stuck in bog' is the wordplay.
'just' becomes 'right' (similar in meaning).
'being stuck in' indicates putting letters inside.
'bog' becomes 'fen' (I've seen this in another clue).
'right' going into 'fen' is 'FRIGHTEN'.
(Other definitions for frighten that I've seen before include "Terrify" , "Put the wind up" , "Cause fear" , "Cause alarm" , "Cow" .)