Talk — or the opposite? (8)
I believe the answer is:
converse
This clue is a double definition.
'talk' is the first definition.
(I know that converse is a more specific form of the action talk)
'the opposite?' is the second definition.
(I've seen this before)
'or' is the link.
(Other definitions for converse that I've seen before include "Remain silent? No" , "Talk together" , "express thoughts and ideas?" , "Discourse" , "take part in discussion" .)