Start to chinwag and have aimless talk (4)
I believe the answer is:
chat
'aimless talk' is the definition.
'chat' can be an answer for 'talk' (thesaurus). I'm unsure of the 'aimless' bit.
'start to chinwag and have' is the wordplay.
'start to' suggests taking the first letters.
'and' is a charade indicator (letters next to each other).
'have' becomes 'hat' (I can't justify this - if you can you should believe this answer much more).
The first letter of 'chinwag' is 'c'.
'c'+'hat'='CHAT'
Can you help me to learn more?
(Other definitions for chat that I've seen before include "An inconsequential and informal talk" , "A bird; converse" , "tittle-tattle" , "Talking" , "Talk amiably - bird" .)