Excluded poet, say (6)
I believe the answer is:
barred
'excluded' is the definition.
('bar' can be a synonym of 'exclude')
'poet say' is the wordplay.
'poet' becomes 'bard' (bard is a kind of poet).
'say' indicates a 'sounds like' (homophone) clue.
'bard' is a homophone of 'BARRED'.
(Other definitions for barred that I've seen before include "Prohibited" , "Wouldn't allow" , "Precluded, obstructed" , "Refused entry to local pub" , "Refused access to, say pub" .)