Conference, perhaps duo discussed (4)
I believe the answer is:
pear
'conference perhaps' is the definition.
(conference is a type of pear)
'duo discussed' is the wordplay.
'duo' becomes 'pair' (synonyms).
'discussed' shows a homophone (sound like).
'pair' is a homophone of 'PEAR'.
(Other definitions for pear that I've seen before include "Bartlett fruit" , "Avocado" , "Alternative to apple" , "Brand" , "A fruit; sounds like couple" .)