Feature a comedian after the talk (7)
I believe the answer is:
chinwag
'the talk' is the definition.
(I've seen this before)
'feature a comedian after' is the wordplay.
'feature' becomes 'chin' (chin is a kind of feature).
'a comedian' becomes 'wag' (I've seen this before).
'after' means one lot of letters go next to another.
'chin'+'wag'='CHINWAG'
(Other definitions for chinwag that I've seen before include "Move mandible about in informal chat" , "Chat (slang)" , "Natter" , "Informal chat moving lower jaw" , "Talk (sl.)" .)