Runs off the stage? (4)
I believe the answer is:
boos
'runs off the stage?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for boos that I've seen before include "Sounds of disapproval" , "Shows disapproval" , "Catcalls" , "Shouts of derision" , "Shouts of disapproval" .)