Screaming (7)
I believe the answer is:
yelling
'screaming' is the definition.
('yell' can be a synonym of 'scream')
This is the entire clue.
(Other definitions for yelling that I've seen before include "Screaming" , "Bellowing" , "Uttering loud cries" , "Hollering, howling" , "Shouting loudly" .)