Poet's not admitted to the audience (4)
I believe the answer is:
bard
'poet's' is the definition.
(I've seen this before)
'not admitted to the audience' is the wordplay.
'not admitted' becomes 'barred'.
'to the audience' shows a homophone (sound like).
'barred' sounds like 'BARD'.
(Other definitions for bard that I've seen before include "Ancient poet" , "Eisteddfod winner" , "Epic poet" , "Traditional poet" , "A lyric poet" .)