Blocked poet of the spoken word (6)

I believe the answer is:

barred

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'blocked' is the definition.
(barring is a kind of blocking)

I can't explain the rest of the clue.

(Other definitions for barred that I've seen before include "Prohibited" , "Refused access to, say pub" , "Excluded, blocked" , "Wouldn't allow" , "Precluded, obstructed" .)

I've seen this clue in the Sydney Morning Herald.

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