Prohibited poet for the audience (6)
I believe the answer is:
barred
'prohibited' is the definition.
(barring is a kind of prohibiting)
'poet for the audience' is the wordplay.
'poet' becomes 'bard' (bard is a kind of poet).
'for the audience' indicates a 'sounds like' (homophone) clue (how an audience might hear it).
'bard' sounds like 'BARRED'.
(Other definitions for barred that I've seen before include "Precluded, obstructed" , "Refused access to, say pub" , "Excluded, blocked" , "Wouldn't allow" , "Prohibited" .)