Anxiety's extreme, going over point (4)
I believe the answer is:
Here is my best explanation:
'anxiety's' is the definition.
(fear is a kind of anxiety)
'extreme going over point' is the wordplay.
'extreme' becomes 'far' (I've seen this in other clues).
'going over' is an insertion indicator.
'point' becomes 'e' (E is an example).
'far' placed around 'e' is 'FEAR'.