The most common and most likely answer to this crossword clue is the 14 letter word CONVERSATIONAL
I've seen this crossword clue in The Sunday Telegraph
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More clues leading to the result CONVERSATIONAL
Buddy explains!

The straight part
We know that "Like chatting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like chatting = conversational.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CONVERSATIONAL mean?
CONVERSATIONAL adjective- Of, relating to, or in the style of a conversation; informal and chatty
- Involving a two-way exchange of messages, such as between a client and a server
- Of, relating to, a patient; that may be conversed with (e.g. on examination)