Shouted - scared me stupid! (8)
I believe the answer is:
screamed
'shouted' is the definition.
(screaming is a kind of shouting)
'scared me stupid' is the wordplay.
'stupid' is an anagram indicator (in a stupid order).
'scared'+'me'='scaredme'
'scaredme' anagrammed gives 'SCREAMED'.
(Other definitions for screamed that I've seen before include "Uttered a sudden high-pitched cry" , "Shrieked" , "Uttered a loud, high-pitched cry" , "Uttered loud cries" , "Utter a loud, high-pitched cry" .)