Look unpleasant for the audience (4)
I believe the answer is:
mien
'look' is the definition.
(mien means a look or impression)
'unpleasant for the audience' is the wordplay.
'unpleasant' becomes 'mean'.
'for the audience' shows a homophone (sound like) (how an audience might hear it).
'mean' is a homophone of 'MIEN'.
(Other definitions for mien that I've seen before include "attitude" , "A countenance like mine" , "The carriage" , "Air - look - manner" , "Counterance - mine?" .)