Starlet out to shock (7)
I believe the answer is:
startle
'to shock' is the definition.
(I know that startle is a more specific form of the action ball over)
'starlet out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'starlet' anagrammed gives 'STARTLE'.
(Other definitions for startle that I've seen before include "Cause to jump" , "Make jump" , "Shock (someone)" , "Alarm suddenly" , "Surprise with starlet" .)