Yell, “Riot!” (6)
I believe the answer is:
scream
I believe this clue is a double definition.
'yell' is the first definition.
(I know that scream is a type of yell)
'riot' is the second definition.
(I know that riot can be written as scream)
(Other definitions for scream that I've seen before include "Cry of anguish" , "Comic" , "Howl, shriek" , "Utter a sudden loud cry" , "funny man" .)