Talk about treat after new start (6)
I believe the answer is:
natter
'talk' is the definition.
(I know that natter is a kind of converse)
'about treat after new start' is the wordplay.
'about' is an anagram indicator.
'after' is a charade indicator (letters next to each other).
'start' indicates taking the first letters.
The first letter of 'new' is 'n'.
'treat' anagrammed gives 'atter'.
'atter' after 'n' is 'NATTER'.
(Other definitions for natter that I've seen before include "Talk inconsequentially" , "Casual talk" , "Talk socially without exchanging too much information" , "Chat busily" , "idle talk" .)