One attached to bottle's taken in by fancy settee for confidential chats (4-1-5)

'confidential chats' is the definition.
'tete-a-tetes' can be an answer for 'chats' (I've seen this in another clue). I'm not sure about the 'confidential' bit.

'one attached to bottle's taken in by fancy settee' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'attached to' says to put letters next to each other.
'bottle's' becomes 'tet' (I can't justify this - if you can you should give a lot more credence to this answer).
'taken in by' means one lot of letters goes inside another.
'fancy' is an anagram indicator.
'a'+'tet'='atet'
'settee' is an anagram of 'tetees'.
'atet' going inside 'tetees' is 'TETE-A-TETES'.

'for' acts as a link.

Can you help me to learn more?