"Go away to grasp English!" editor shrieked (8)
I believe the answer is:
screamed
'shrieked' is the definition.
(I've seen this before)
'go away to grasp english editor' is the wordplay.
'go away' becomes 'scram' (scramming is a kind of going away).
'to grasp' indicates putting letters inside.
'english' becomes 'E' (abbreviation).
'editor' becomes 'ed' (abbreviation).
'scram' enclosing 'e' is 'scream'.
'scream'+'ed'='SCREAMED'
(Other definitions for screamed that I've seen before include "9 [HOLLERED]" , "Cried out in a loud high-pitched voice" , "Uttered loud cries" , "Yelled" , "Uttered a sudden high-pitched cry" .)