Notes taken about a restricted conversation? (4-1-4)
I believe the answer is:
tete-a-tete
'restricted conversation?' is the definition.
(conversation between two people)
'notes taken about a' is the wordplay.
'notes' becomes 'te te te te' (the musical note 'te' four times).
'taken about' means one lot of letters goes inside another.
'tetetete' going around 'a' is 'TETE-A-TETE'.
(Other definitions for tete-a-tete that I've seen before include "Private meeting" , "Private conversation between two people as in France" , "One-to-one meeting" , "Informal chat" , "Private couple's conversation" .)