Deliver poem perhaps about spectacle mentioned in speech (6)
I believe the answer is:
recite
'deliver poem perhaps' is the definition.
'about spectacle mentioned in speech' is the wordplay.
'about' becomes 're' (regarding).
'spectacle' becomes 'sight' (I've seen this before).
'mentioned in speech' shows a homophone (sound like).
'sight' is a homophone of 'cite'.
're'+'cite'='RECITE'
(Other definitions for recite that I've seen before include "Render verbally" , "Intone" , "Declaim, recount" , "Speak by heart aloud" , "Repeat, recount" .)